本文实例总结了JavaScript常用工具函数。分享给大家供大家参考,具体如下:

为元素添加on方法

Element.prototype.on = Element.prototype.addEventListener;

NodeList.prototype.on = function (event, fn) {、
 []['forEach'].call(this, function (el) {
  el.on(event, fn);
 });
 return this;
};

为元素添加trigger方法

Element.prototype.trigger = function(type, data) {
 var event = document.createEvent("HTMLEvents");
 event.initEvent(type, true, true);
 event.data = data || {};
 event.eventName = type;
 event.target = this;
 this.dispatchEvent(event);
 return this;
};

NodeList.prototype.trigger = function(event) {
 []["forEach"].call(this, function(el) {
 el["trigger"](event);
 });
 return this;
};

转义html标签

function HtmlEncode(text) {
 return text
 .replace(/&/g, "&")
 .replace(/\"/g, '"')
 .replace(/</g, "<")
 .replace(/>/g, ">");
}

HTML标签转义

// HTML 标签转义
// @param {Array.<DOMString>} templateData 字符串类型的tokens
// @param {...} ..vals 表达式占位符的运算结果tokens
//
function SaferHTML(templateData) {
 var s = templateData[0];
 for (var i = 1; i < arguments.length; i++) {
 var arg = String(arguments[i]);
 // Escape special characters in the substitution.
 s += arg
  .replace(/&/g, "&amp;")
  .replace(/</g, "&lt;")
  .replace(/>/g, "&gt;");
 // Don't escape special characters in the template.
 s += templateData[i];
 }
 return s;
}
// 调用
var html = SaferHTML`<p>这是关于字符串模板的介绍</p>`;

跨浏览器绑定事件

function addEventSamp(obj, evt, fn) {
 if (!oTarget) {
 return;
 }
 if (obj.addEventListener) {
 obj.addEventListener(evt, fn, false);
 } else if (obj.attachEvent) {
 obj.attachEvent("on" + evt, fn);
 } else {
 oTarget["on" + sEvtType] = fn;
 }
}

加入收藏夹

function addFavorite(sURL, sTitle) {
 try {
 window.external.addFavorite(sURL, sTitle);
 } catch (e) {
 try {
  window.sidebar.addPanel(sTitle, sURL, "");
 } catch (e) {
  alert("加入收藏失败,请使用Ctrl+D进行添加");
 }
 }
}

提取页面代码中所有网址

var aa = document.documentElement.outerHTML
 .match(
 /(url\(|src=|href=)[\"\']*([^\"\'\(\)\<\>\[\] ]+)[\"\'\)]*|(http:\/\/[\w\-\.]+[^\"\'\(\)\<\>\[\] ]+)/gi
 )
 .join("\r\n")
 .replace(/^(src=|href=|url\()[\"\']*|[\"\'\>\) ]*$/gim, "");
alert(aa);

动态加载脚本文件

function appendscript(src, text, reload, charset) {
 var id = hash(src + text);
 if (!reload && in_array(id, evalscripts)) return;
 if (reload && $(id)) {
 $(id).parentNode.removeChild($(id));
 }

 evalscripts.push(id);
 var scriptNode = document.createElement("script");
 scriptNode.type = "text/javascript";
 scriptNode.id = id;
 scriptNode.charset = charset
 ? charset
 : BROWSER.firefox
 ? document.characterSet
 : document.charset;
 try {
 if (src) {
  scriptNode.src = src;
  scriptNode.onloadDone = false;
  scriptNode.onload = function() {
  scriptNode.onloadDone = true;
  JSLOADED[src] = 1;
  };
  scriptNode.onreadystatechange = function() {
  if (
   (scriptNode.readyState == "loaded" ||
   scriptNode.readyState == "complete") &&
   !scriptNode.onloadDone
  ) {
   scriptNode.onloadDone = true;
   JSLOADED[src] = 1;
  }
  };
 } else if (text) {
  scriptNode.text = text;
 }
 document.getElementsByTagName("head")[0].appendChild(scriptNode);
 } catch (e) {}
}

返回顶部的通用方法

function backTop(btnId) {
 var btn = document.getElementById(btnId);
 var d = document.documentElement;
 var b = document.body;
 window.onscroll = set;
 btn.style.display = "none";
 btn.onclick = function() {
 btn.style.display = "none";
 window.onscroll = null;
 this.timer = setInterval(function() {
  d.scrollTop -= Math.ceil((d.scrollTop + b.scrollTop) * 0.1);
  b.scrollTop -= Math.ceil((d.scrollTop + b.scrollTop) * 0.1);
  if (d.scrollTop + b.scrollTop == 0)
  clearInterval(btn.timer, (window.onscroll = set));
 }, 10);
 };
 function set() {
 btn.style.display = d.scrollTop + b.scrollTop > 100 ? "block" : "none";
 }
}
backTop("goTop");

实现base64解码

function base64_decode(data) {
 var b64 = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";
 var o1,
 o2,
 o3,
 h1,
 h2,
 h3,
 h4,
 bits,
 i = 0,
 ac = 0,
 dec = "",
 tmp_arr = [];
 if (!data) {
 return data;
 }
 data += "";
 do {
 h1 = b64.indexOf(data.charAt(i++));
 h2 = b64.indexOf(data.charAt(i++));
 h3 = b64.indexOf(data.charAt(i++));
 h4 = b64.indexOf(data.charAt(i++));
 bits = (h1 << 18) | (h2 << 12) | (h3 << 6) | h4;
 o1 = (bits >> 16) & 0xff;
 o2 = (bits >> 8) & 0xff;
 o3 = bits & 0xff;
 if (h3 == 64) {
  tmp_arr[ac++] = String.fromCharCode(o1);
 } else if (h4 == 64) {
  tmp_arr[ac++] = String.fromCharCode(o1, o2);
 } else {
  tmp_arr[ac++] = String.fromCharCode(o1, o2, o3);
 }
 } while (i < data.length);
 dec = tmp_arr.join("");
 dec = utf8_decode(dec);
 return dec;
}

确认是否是键盘有效输入值

function checkKey(iKey) {
 if (iKey == 32 || iKey == 229) {
 return true;
 } /*空格和异常*/
 if (iKey > 47 && iKey < 58) {
 return true;
 } /*数字*/
 if (iKey > 64 && iKey < 91) {
 return true;
 } /*字母*/
 if (iKey > 95 && iKey < 108) {
 return true;
 } /*数字键盘1*/
 if (iKey > 108 && iKey < 112) {
 return true;
 } /*数字键盘2*/
 if (iKey > 185 && iKey < 193) {
 return true;
 } /*符号1*/
 if (iKey > 218 && iKey < 223) {
 return true;
 } /*符号2*/
 return false;
}

全角半角转换

//iCase: 0全到半,1半到全,其他不转化
function chgCase(sStr, iCase) {
 if (
 typeof sStr != "string" ||
 sStr.length <= 0 ||
 !(iCase === 0 || iCase == 1)
 ) {
 return sStr;
 }
 var i,
 oRs = [],
 iCode;
 if (iCase) {
 /*半->全*/
 for (i = 0; i < sStr.length; i += 1) {
  iCode = sStr.charCodeAt(i);
  if (iCode == 32) {
  iCode = 12288;
  } else if (iCode < 127) {
  iCode += 65248;
  }
  oRs.push(String.fromCharCode(iCode));
 }
 } else {
 /*全->半*/
 for (i = 0; i < sStr.length; i += 1) {
  iCode = sStr.charCodeAt(i);
  if (iCode == 12288) {
  iCode = 32;
  } else if (iCode > 65280 && iCode < 65375) {
  iCode -= 65248;
  }
  oRs.push(String.fromCharCode(iCode));
 }
 }
 return oRs.join("");
}

版本对比

function compareVersion(v1, v2) {
 v1 = v1.split(".");
 v2 = v2.split(".");

 var len = Math.max(v1.length, v2.length);

 while (v1.length < len) {
 v1.push("0");
 }

 while (v2.length < len) {
 v2.push("0");
 }

 for (var i = 0; i < len; i++) {
 var num1 = parseInt(v1[i]);
 var num2 = parseInt(v2[i]);

 if (num1 > num2) {
  return 1;
 } else if (num1 < num2) {
  return -1;
 }
 }
 return 0;
}

压缩CSS样式代码

function compressCss(s) {
 //压缩代码
 s = s.replace(/\/\*(.|\n)*?\*\//g, ""); //删除注释
 s = s.replace(/\s*([\{\}\:\;\,])\s*/g, "$1");
 s = s.replace(/\,[\s\.\#\d]*\{/g, "{"); //容错处理
 s = s.replace(/;\s*;/g, ";"); //清除连续分号
 s = s.match(/^\s*(\S+(\s+\S+)*)\s*$/); //去掉首尾空白
 return s == null ? "" : s[1];
}

获取当前路径

var currentPageUrl = "";
if (typeof this.href === "undefined") {
 currentPageUrl = document.location.toString().toLowerCase();
} else {
 currentPageUrl = this.href.toString().toLowerCase();
}

字符串长度截取

function cutstr(str, len) {
 var temp,
  icount = 0,
  patrn = /[^\x00-\xff]/,
  strre = "";
 for (var i = 0; i < str.length; i++) {
  if (icount < len - 1) {
   temp = str.substr(i, 1);
    if (patrn.exec(temp) == null) {
     icount = icount + 1
   } else {
    icount = icount + 2
   }
   strre += temp
   } else {
   break;
  }
 }
 return strre + "..."
}

时间日期格式转换

Date.prototype.format = function(formatStr) {
 var str = formatStr;
 var Week = ["日", "一", "二", "三", "四", "五", "六"];
 str = str.replace(/yyyy|YYYY/, this.getFullYear());
 str = str.replace(
 /yy|YY/,
 this.getYear() % 100 > 9
  ? (this.getYear() % 100).toString()
  : "0" + (this.getYear() % 100)
 );
 str = str.replace(
 /MM/,
 this.getMonth() + 1 > 9
  ? (this.getMonth() + 1).toString()
  : "0" + (this.getMonth() + 1)
 );
 str = str.replace(/M/g, this.getMonth() + 1);
 str = str.replace(/w|W/g, Week[this.getDay()]);
 str = str.replace(
 /dd|DD/,
 this.getDate() > 9 ? this.getDate().toString() : "0" + this.getDate()
 );
 str = str.replace(/d|D/g, this.getDate());
 str = str.replace(
 /hh|HH/,
 this.getHours() > 9 ? this.getHours().toString() : "0" + this.getHours()
 );
 str = str.replace(/h|H/g, this.getHours());
 str = str.replace(
 /mm/,
 this.getMinutes() > 9
  ? this.getMinutes().toString()
  : "0" + this.getMinutes()
 );
 str = str.replace(/m/g, this.getMinutes());
 str = str.replace(
 /ss|SS/,
 this.getSeconds() > 9
  ? this.getSeconds().toString()
  : "0" + this.getSeconds()
 );
 str = str.replace(/s|S/g, this.getSeconds());
 return str;
};

// 或
Date.prototype.format = function(format) {
 var o = {
 "M+": this.getMonth() + 1, //month
 "d+": this.getDate(), //day
 "h+": this.getHours(), //hour
 "m+": this.getMinutes(), //minute
 "s+": this.getSeconds(), //second
 "q+": Math.floor((this.getMonth() + 3) / 3), //quarter
 S: this.getMilliseconds() //millisecond
 };
 if (/(y+)/.test(format))
 format = format.replace(
  RegExp.$1,
  (this.getFullYear() + "").substr(4 - RegExp.$1.length)
 );
 for (var k in o) {
 if (new RegExp("(" + k + ")").test(format))
  format = format.replace(
  RegExp.$1,
  RegExp.$1.length == 1 ? o[k] : ("00" + o[k]).substr(("" + o[k]).length)
  );
 }
 return format;
};
alert(new Date().format("yyyy-MM-dd hh:mm:ss"));

跨浏览器删除事件

function delEvt(obj, evt, fn) {
 if (!obj) {
 return;
 }
 if (obj.addEventListener) {
 obj.addEventListener(evt, fn, false);
 } else if (oTarget.attachEvent) {
 obj.attachEvent("on" + evt, fn);
 } else {
 obj["on" + evt] = fn;
 }
}

判断是否以某个字符串结束

String.prototype.endWith = function(s) {
 var d = this.length - s.length;
 return d >= 0 && this.lastIndexOf(s) == d;
};

返回脚本内容

function evalscript(s) {
 if (s.indexOf("<script") == -1) return s;
 var p = /<script[^\>]*?>([^\x00]*?)<\/script>/gi;
 var arr = [];
 while ((arr = p.exec(s))) {
 var p1 = /<script[^\>]*?src=\"([^\>]*?)\"[^\>]*?(reload=\"1\")?(?:charset=\"([\w\-]+?)\")?><\/script>/i;
 var arr1 = [];
 arr1 = p1.exec(arr[0]);
 if (arr1) {
  appendscript(arr1[1], "", arr1[2], arr1[3]);
 } else {
  p1 = /<script(.*?)>([^\x00]+?)<\/script>/i;
  arr1 = p1.exec(arr[0]);
  appendscript("", arr1[2], arr1[1].indexOf("reload=") != -1);
 }
 }
 return s;
}

格式化CSS样式代码

function formatCss(s) {
 //格式化代码
 s = s.replace(/\s*([\{\}\:\;\,])\s*/g, "$1");
 s = s.replace(/;\s*;/g, ";"); //清除连续分号
 s = s.replace(/\,[\s\.\#\d]*{/g, "{");
 s = s.replace(/([^\s])\{([^\s])/g, "$1 {\n\t$2");
 s = s.replace(/([^\s])\}([^\n]*)/g, "$1\n}\n$2");
 s = s.replace(/([^\s]);([^\s\}])/g, "$1;\n\t$2");
 return s;
}

获取cookie值

function getCookie(name) {
 var arr = document.cookie.match(new RegExp("(^| )" + name + "=([^;]*)(;|$)"));
 if (arr != null) return unescape(arr[2]);
 return null;
}

获得URL中GET参数值

// 用法:如果地址是 test.htm?t1=1&t2=2&t3=3, 那么能取得:GET["t1"], GET["t2"], GET["t3"]
function getGet() {
 querystr = window.location.href.split("?");
 if (querystr[1]) {
 GETs = querystr[1].split("&");
 GET = [];
 for (i = 0; i < GETs.length; i++) {
  tmp_arr = GETs.split("=");
  key = tmp_arr[0];
  GET[key] = tmp_arr[1];
 }
 }
 return querystr[1];
}

获取移动设备初始化大小

function getInitZoom() {
 if (!this._initZoom) {
 var screenWidth = Math.min(screen.height, screen.width);
 if (this.isAndroidMobileDevice() && !this.isNewChromeOnAndroid()) {
  screenWidth = screenWidth / window.devicePixelRatio;
 }
 this._initZoom = screenWidth / document.body.offsetWidth;
 }
 return this._initZoom;
}

获取页面高度

function getPageHeight() {
 var g = document,
 a = g.body,
 f = g.documentElement,
 d = g.compatMode == "BackCompat" ? a : g.documentElement;
 return Math.max(f.scrollHeight, a.scrollHeight, d.clientHeight);
}

获取页面scrollLeft

function getPageScrollLeft() {
 var a = document;
 return a.documentElement.scrollLeft || a.body.scrollLeft;
}

获取页面scrollTop

function getPageScrollTop() {
 var a = document;
 return a.documentElement.scrollTop || a.body.scrollTop;
}

获取页面可视高度

function getPageViewHeight() {
 var d = document,
 a = d.compatMode == "BackCompat" ? d.body : d.documentElement;
 return a.clientHeight;
}

获取页面可视宽度

function getPageViewWidth() {
 var d = document,
 a = d.compatMode == "BackCompat" ? d.body : d.documentElement;
 return a.clientWidth;
}

获取页面宽度

function getPageWidth() {
 var g = document,
 a = g.body,
 f = g.documentElement,
 d = g.compatMode == "BackCompat" ? a : g.documentElement;
 return Math.max(f.scrollWidth, a.scrollWidth, d.clientWidth);
}

获取移动设备屏幕宽度

function getScreenWidth() {
 var smallerSide = Math.min(screen.width, screen.height);
 var fixViewPortsExperiment =
 rendererModel.runningExperiments.FixViewport ||
 rendererModel.runningExperiments.fixviewport;
 var fixViewPortsExperimentRunning =
 fixViewPortsExperiment && fixViewPortsExperiment.toLowerCase() === "new";
 if (fixViewPortsExperiment) {
 if (this.isAndroidMobileDevice() && !this.isNewChromeOnAndroid()) {
  smallerSide = smallerSide / window.devicePixelRatio;
 }
 }
 return smallerSide;
}

获取网页被卷去的位置

function getScrollXY() {
 return document.body.scrollTop
 ? {
  x: document.body.scrollLeft,
  y: document.body.scrollTop
  }
 : {
  x: document.documentElement.scrollLeft,
  y: document.documentElement.scrollTop
  };
}

获取URL上的参数

// 获取URL中的某参数值,不区分大小写
// 获取URL中的某参数值,不区分大小写,
// 默认是取'hash'里的参数,
// 如果传其他参数支持取‘search'中的参数
// @param {String} name 参数名称
export function getUrlParam(name, type = "hash") {
 let newName = name,
 reg = new RegExp("(^|&)" + newName + "=([^&]*)(&|$)", "i"),
 paramHash = window.location.hash.split("?")[1] || "",
 paramSearch = window.location.search.split("?")[1] || "",
 param;

 type === "hash" ? (param = paramHash) : (param = paramSearch);

 let result = param.match(reg);

 if (result != null) {
 return result[2].split("/")[0];
 }
 return null;
}

检验URL链接是否有效

function getUrlState(URL) {
 var xmlhttp = new ActiveXObject("microsoft.xmlhttp");
 xmlhttp.Open("GET", URL, false);
 try {
 xmlhttp.Send();
 } catch (e) {
 } finally {
 var result = xmlhttp.responseText;
 if (result) {
  if (xmlhttp.Status == 200) {
  return true;
  } else {
  return false;
  }
 } else {
  return false;
 }
 }
}

获取窗体可见范围的宽与高

function getViewSize() {
 var de = document.documentElement;
 var db = document.body;
 var viewW = de.clientWidth == 0 ? db.clientWidth : de.clientWidth;
 var viewH = de.clientHeight == 0 ? db.clientHeight : de.clientHeight;
 return Array(viewW, viewH);
}

获取移动设备最大化大小

function getZoom() {
 var screenWidth =
 Math.abs(window.orientation) === 90
  ? Math.max(screen.height, screen.width)
  : Math.min(screen.height, screen.width);
 if (this.isAndroidMobileDevice() && !this.isNewChromeOnAndroid()) {
 screenWidth = screenWidth / window.devicePixelRatio;
 }
 var FixViewPortsExperiment =
 rendererModel.runningExperiments.FixViewport ||
 rendererModel.runningExperiments.fixviewport;
 var FixViewPortsExperimentRunning =
 FixViewPortsExperiment &&
 (FixViewPortsExperiment === "New" || FixViewPortsExperiment === "new");
 if (FixViewPortsExperimentRunning) {
 return screenWidth / window.innerWidth;
 } else {
 return screenWidth / document.body.offsetWidth;
 }
}

判断是否安卓移动设备访问

function isAndroidMobileDevice() {
 return /android/i.test(navigator.userAgent.toLowerCase());
}

判断是否苹果移动设备访问

function isAppleMobileDevice() {
 return /iphone|ipod|ipad|Macintosh/i.test(navigator.userAgent.toLowerCase());
}

判断是否为数字类型

function isDigit(value) {
 var patrn = /^[0-9]*$/;
 if (patrn.exec(value) == null || value == "") {
 return false;
 } else {
 return true;
 }
}

是否是某类手机型号

// 用devicePixelRatio和分辨率判断
const isIphonex = () => {
 // X XS, XS Max, XR
 const xSeriesConfig = [
 {
  devicePixelRatio: 3,
  width: 375,
  height: 812
 },
 {
  devicePixelRatio: 3,
  width: 414,
  height: 896
 },
 {
  devicePixelRatio: 2,
  width: 414,
  height: 896
 }
 ];
 // h5
 if (typeof window !== "undefined" && window) {
 const isIOS = /iphone/gi.test(window.navigator.userAgent);
 if (!isIOS) return false;
 const { devicePixelRatio, screen } = window;
 const { width, height } = screen;
 return xSeriesConfig.some(
  item =>
  item.devicePixelRatio === devicePixelRatio &&
  item.width === width &&
  item.height === height
 );
 }
 return false;
};

判断是否移动设备

function isMobile() {
 if (typeof this._isMobile === "boolean") {
 return this._isMobile;
 }
 var screenWidth = this.getScreenWidth();
 var fixViewPortsExperiment =
 rendererModel.runningExperiments.FixViewport ||
 rendererModel.runningExperiments.fixviewport;
 var fixViewPortsExperimentRunning =
 fixViewPortsExperiment && fixViewPortsExperiment.toLowerCase() === "new";
 if (!fixViewPortsExperiment) {
 if (!this.isAppleMobileDevice()) {
  screenWidth = screenWidth / window.devicePixelRatio;
 }
 }
 var isMobileScreenSize = screenWidth < 600;
 var isMobileUserAgent = false;
 this._isMobile = isMobileScreenSize && this.isTouchScreen();
 return this._isMobile;
}

判断吗是否手机号码

function isMobileNumber(e) {
 var i =
  "134,135,136,137,138,139,150,151,152,157,158,159,187,188,147,182,183,184,178",
 n = "130,131,132,155,156,185,186,145,176",
 a = "133,153,180,181,189,177,173,170",
 o = e || "",
 r = o.substring(0, 3),
 d = o.substring(0, 4),
 s =
  !!/^1\d{10}$/.test(o) &&
  (n.indexOf(r) >= 0
  ? "联通"
  : a.indexOf(r) >= 0
  ? "电信"
  : "1349" == d
  ? "电信"
  : i.indexOf(r) >= 0
  ? "移动"
  : "未知");
 return s;
}

判断是否是移动设备访问

function isMobileUserAgent() {
 return /iphone|ipod|android.*mobile|windows.*phone|blackberry.*mobile/i.test(
 window.navigator.userAgent.toLowerCase()
 );
}

判断鼠标是否移出事件

function isMouseOut(e, handler) {
 if (e.type !== "mouseout") {
 return false;
 }
 var reltg = e.relatedTarget
 ? e.relatedTarget
 : e.type === "mouseout"
 ? e.toElement
 : e.fromElement;
 while (reltg && reltg !== handler) {
 reltg = reltg.parentNode;
 }
 return reltg !== handler;
}

判断是否Touch屏幕

function isTouchScreen() {
 return (
 "ontouchstart" in window ||
 (window.DocumentTouch && document instanceof DocumentTouch)
 );
}

判断是否为网址

function isURL(strUrl) {
 var regular = /^\b(((https?|ftp):\/\/)?[-a-z0-9]+(\.[-a-z0-9]+)*\.(?:com|edu|gov|int|mil|net|org|biz|info|name|museum|asia|coop|aero|[a-z][a-z]|((25[0-5])|(2[0-4]\d)|(1\d\d)|([1-9]\d)|\d))\b(\/[-a-z0-9_:\@&?=+,.!\/~%\$]*)?)$/i;
 if (regular.test(strUrl)) {
 return true;
 } else {
 return false;
 }
}

判断是否打开视窗

function isViewportOpen() {
 return !!document.getElementById("wixMobileViewport");
}

加载样式文件

function loadStyle(url) {
 try {
 document.createStyleSheet(url);
 } catch (e) {
 var cssLink = document.createElement("link");
 cssLink.rel = "stylesheet";
 cssLink.type = "text/css";
 cssLink.href = url;
 var head = document.getElementsByTagName("head")[0];
 head.appendChild(cssLink);
 }
}

替换地址栏

function locationReplace(url) {
 if (history.replaceState) {
 history.replaceState(null, document.title, url);
 history.go(0);
 } else {
 location.replace(url);
 }
}

解决offsetX兼容性问题

// 针对火狐不支持offsetX/Y
function getOffset(e) {
 var target = e.target, // 当前触发的目标对象
 eventCoord,
 pageCoord,
 offsetCoord;

 // 计算当前触发元素到文档的距离
 pageCoord = getPageCoord(target);

 // 计算光标到文档的距离
 eventCoord = {
 X: window.pageXOffset + e.clientX,
 Y: window.pageYOffset + e.clientY
 };

 // 相减获取光标到第一个定位的父元素的坐标
 offsetCoord = {
 X: eventCoord.X - pageCoord.X,
 Y: eventCoord.Y - pageCoord.Y
 };
 return offsetCoord;
}

function getPageCoord(element) {
 var coord = { X: 0, Y: 0 };
 // 计算从当前触发元素到根节点为止,
 // 各级 offsetParent 元素的 offsetLeft 或 offsetTop 值之和
 while (element) {
 coord.X += element.offsetLeft;
 coord.Y += element.offsetTop;
 element = element.offsetParent;
 }
 return coord;
}

打开一个窗体通用方法

function openWindow(url, windowName, width, height) {
 var x = parseInt(screen.width / 2.0) - width / 2.0;
 var y = parseInt(screen.height / 2.0) - height / 2.0;
 var isMSIE = navigator.appName == "Microsoft Internet Explorer";
 if (isMSIE) {
 var p = "resizable=1,location=no,scrollbars=no,width=";
 p = p + width;
 p = p + ",height=";
 p = p + height;
 p = p + ",left=";
 p = p + x;
 p = p + ",top=";
 p = p + y;
 retval = window.open(url, windowName, p);
 } else {
 var win = window.open(
  url,
  "ZyiisPopup",
  "top=" +
  y +
  ",left=" +
  x +
  ",scrollbars=" +
  scrollbars +
  ",dialog=yes,modal=yes,width=" +
  width +
  ",height=" +
  height +
  ",resizable=no"
 );
 eval("try { win.resizeTo(width, height); } catch(e) { }");
 win.focus();
 }
}

将键值对拼接成URL带参数

export default const fnParams2Url = obj=> {
  let aUrl = []
  let fnAdd = function(key, value) {
  return key + '=' + value
  }
  for (var k in obj) {
  aUrl.push(fnAdd(k, obj[k]))
  }
  return encodeURIComponent(aUrl.join('&'))
 }

去掉url前缀

function removeUrlPrefix(a) {
 a = a
 .replace(/:/g, ":")
 .replace(/./g, ".")
 .replace(///g, "/");
 while (
 trim(a)
  .toLowerCase()
  .indexOf("http://") == 0
 ) {
 a = trim(a.replace(/http:\/\//i, ""));
 }
 return a;
}

替换全部

String.prototype.replaceAll = function(s1, s2) {
 return this.replace(new RegExp(s1, "gm"), s2);
};

resize的操作

(function() {
 var fn = function() {
 var w = document.documentElement
  ? document.documentElement.clientWidth
  : document.body.clientWidth,
  r = 1255,
  b = Element.extend(document.body),
  classname = b.className;
 if (w < r) {
  //当窗体的宽度小于1255的时候执行相应的操作
 } else {
  //当窗体的宽度大于1255的时候执行相应的操作
 }
 };
 if (window.addEventListener) {
 window.addEventListener("resize", function() {
  fn();
 });
 } else if (window.attachEvent) {
 window.attachEvent("onresize", function() {
  fn();
 });
 }
 fn();
})();

滚动到顶部

// 使用document.documentElement.scrollTop 或 document.body.scrollTop 获取到顶部的距离,从顶部
// 滚动一小部分距离。使用window.requestAnimationFrame()来滚动。
// @example
// scrollToTop();
function scrollToTop() {
 var c = document.documentElement.scrollTop || document.body.scrollTop;

 if (c > 0) {
 window.requestAnimationFrame(scrollToTop);
 window.scrollTo(0, c - c / 8);
 }
}

设置cookie值

function setCookie(name, value, Hours) {
 var d = new Date();
 var offset = 8;
 var utc = d.getTime() + d.getTimezoneOffset() * 60000;
 var nd = utc + 3600000 * offset;
 var exp = new Date(nd);
 exp.setTime(exp.getTime() + Hours * 60 * 60 * 1000);
 document.cookie =
 name +
 "=" +
 escape(value) +
 ";path=/;expires=" +
 exp.toGMTString() +
 ";domain=360doc.com;";
}

设为首页

function setHomepage() {
 if (document.all) {
 document.body.style.behavior = "url(#default#homepage)";
 document.body.setHomePage("http://w3cboy.com");
 } else if (window.sidebar) {
 if (window.netscape) {
  try {
  netscape.security.PrivilegeManager.enablePrivilege(
   "UniversalXPConnect"
  );
  } catch (e) {
  alert(
   "该操作被浏览器拒绝,如果想启用该功能,请在地址栏内输入 about:config,然后将项 signed.applets.codebase_principal_support 值该为true"
  );
  }
 }
 var prefs = Components.classes[
  "@mozilla.org/preferences-service;1"
 ].getService(Components.interfaces.nsIPrefBranch);
 prefs.setCharPref("browser.startup.homepage", "http://w3cboy.com");
 }
}

按字母排序,对每行进行数组排序

function setSort() {
 var text = K1.value
 .split(/[\r\n]/)
 .sort()
 .join("\r\n"); //顺序
 var test = K1.value
 .split(/[\r\n]/)
 .sort()
 .reverse()
 .join("\r\n"); //反序
 K1.value = K1.value != text ? text : test;
}

延时执行

// 比如 sleep(1000) 意味着等待1000毫秒,还可从 Promise、Generator、Async/Await 等角度实现。
// Promise
const sleep = time => {
 return new Promise(resolve => setTimeout(resolve, time));
};

sleep(1000).then(() => {
 console.log(1);
});


// Generator
function* sleepGenerator(time) {
 yield new Promise(function(resolve, reject) {
 setTimeout(resolve, time);
 });
}

sleepGenerator(1000)
 .next()
 .value.then(() => {
 console.log(1);
 });

//async
function sleep(time) {
 return new Promise(resolve => setTimeout(resolve, time));
}

async function output() {
 let out = await sleep(1000);
 console.log(1);
 return out;
}

output();

function sleep(callback, time) {
 if (typeof callback === "function") {
 setTimeout(callback, time);
 }
}

function output() {
 console.log(1);
}

sleep(output, 1000);

判断是否以某个字符串开头

String.prototype.startWith = function(s) {
 return this.indexOf(s) == 0;
};

清除脚本内容

function stripscript(s) {
 return s.replace(/<script.*?>.*?<\/script>/gi, "");
}

时间个性化输出功能

/*
1、< 60s, 显示为“刚刚”
2、>= 1min && < 60 min, 显示与当前时间差“XX分钟前”
3、>= 60min && < 1day, 显示与当前时间差“今天 XX:XX”
4、>= 1day && < 1year, 显示日期“XX月XX日 XX:XX”
5、>= 1year, 显示具体日期“XXXX年XX月XX日 XX:XX”
*/
function timeFormat(time) {
 var date = new Date(time),
 curDate = new Date(),
 year = date.getFullYear(),
 month = date.getMonth() + 10,
 day = date.getDate(),
 hour = date.getHours(),
 minute = date.getMinutes(),
 curYear = curDate.getFullYear(),
 curHour = curDate.getHours(),
 timeStr;

 if (year < curYear) {
 timeStr = year + "年" + month + "月" + day + "日 " + hour + ":" + minute;
 } else {
 var pastTime = curDate - date,
  pastH = pastTime / 3600000;

 if (pastH > curHour) {
  timeStr = month + "月" + day + "日 " + hour + ":" + minute;
 } else if (pastH >= 1) {
  timeStr = "今天 " + hour + ":" + minute + "分";
 } else {
  var pastM = curDate.getMinutes() - minute;
  if (pastM > 1) {
  timeStr = pastM + "分钟前";
  } else {
  timeStr = "刚刚";
  }
 }
 }
 return timeStr;
}

全角转换为半角函数

function toCDB(str) {
 var result = "";
 for (var i = 0; i < str.length; i++) {
 code = str.charCodeAt(i);
 if (code >= 65281 && code <= 65374) {
  result += String.fromCharCode(str.charCodeAt(i) - 65248);
 } else if (code == 12288) {
  result += String.fromCharCode(str.charCodeAt(i) - 12288 + 32);
 } else {
  result += str.charAt(i);
 }
 }
 return result;
}

半角转换为全角函数

function toDBC(str) {
 var result = "";
 for (var i = 0; i < str.length; i++) {
 code = str.charCodeAt(i);
 if (code >= 33 && code <= 126) {
  result += String.fromCharCode(str.charCodeAt(i) + 65248);
 } else if (code == 32) {
  result += String.fromCharCode(str.charCodeAt(i) + 12288 - 32);
 } else {
  result += str.charAt(i);
 }
 }
 return result;
}

金额大写转换函数

function transform(tranvalue) {
 try {
 var i = 1;
 var dw2 = new Array("", "万", "亿"); //大单位
 var dw1 = new Array("拾", "佰", "仟"); //小单位
 var dw = new Array(
  "零",
  "壹",
  "贰",
  "叁",
  "肆",
  "伍",
  "陆",
  "柒",
  "捌",
  "玖"
 ); 
 //整数部分用
 //以下是小写转换成大写显示在合计大写的文本框中
 //分离整数与小数
 var source = splits(tranvalue);
 var num = source[0];
 var dig = source[1];
 //转换整数部分
 var k1 = 0; //计小单位
 var k2 = 0; //计大单位
 var sum = 0;
 var str = "";
 var len = source[0].length; //整数的长度
 for (i = 1; i <= len; i++) {
  var n = source[0].charAt(len - i); //取得某个位数上的数字
  var bn = 0;
  if (len - i - 1 >= 0) {
  bn = source[0].charAt(len - i - 1); //取得某个位数前一位上的数字
  }
  sum = sum + Number(n);
  if (sum != 0) {
  str = dw[Number(n)].concat(str); //取得该数字对应的大写数字,并插入到str字符串的前面
  if (n == "0") sum = 0;
  }
  if (len - i - 1 >= 0) {
  //在数字范围内
  if (k1 != 3) {
   //加小单位
   if (bn != 0) {
   str = dw1[k1].concat(str);
   }
   k1++;
  } else {
   //不加小单位,加大单位
   k1 = 0;
   var temp = str.charAt(0);
   if (temp == "万" || temp == "亿")
   //若大单位前没有数字则舍去大单位
   str = str.substr(1, str.length - 1);
   str = dw2[k2].concat(str);
   sum = 0;
  }
  }
  if (k1 == 3) {
  //小单位到千则大单位进一
  k2++;
  }
 }
 //转换小数部分
 var strdig = "";
 if (dig != "") {
  var n = dig.charAt(0);
  if (n != 0) {
  strdig += dw[Number(n)] + "角"; //加数字
  }
  var n = dig.charAt(1);
  if (n != 0) {
  strdig += dw[Number(n)] + "分"; //加数字
  }
 }
 str += "元" + strdig;
 } catch (e) {
 return "0元";
 }
 return str;
}
//拆分整数与小数
function splits(tranvalue) {
 var value = new Array("", "");
 temp = tranvalue.split(".");
 for (var i = 0; i < temp.length; i++) {
 value = temp;
 }
 return value;
}

清除空格

String.prototype.trim = function() {
 var reExtraSpace = /^\s*(.*?)\s+$/;
 return this.replace(reExtraSpace, "$1");
};

// 清除左空格
function ltrim(s) {
 return s.replace(/^(\s*| *)/, "");
}

// 清除右空格
function rtrim(s) {
 return s.replace(/(\s*| *)$/, "");
}

随机数时间戳

function uniqueId() {
 var a = Math.random,
 b = parseInt;
 return (
 Number(new Date()).toString() + b(10 * a()) + b(10 * a()) + b(10 * a())
 );
}

实现utf8解码

function utf8_decode(str_data) {
 var tmp_arr = [],
 i = 0,
 ac = 0,
 c1 = 0,
 c2 = 0,
 c3 = 0;
 str_data += "";
 while (i < str_data.length) {
 c1 = str_data.charCodeAt(i);
 if (c1 < 128) {
  tmp_arr[ac++] = String.fromCharCode(c1);
  i++;
 } else if (c1 > 191 && c1 < 224) {
  c2 = str_data.charCodeAt(i + 1);
  tmp_arr[ac++] = String.fromCharCode(((c1 & 31) << 6) | (c2 & 63));
  i += 2;
 } else {
  c2 = str_data.charCodeAt(i + 1);
  c3 = str_data.charCodeAt(i + 2);
  tmp_arr[ac++] = String.fromCharCode(
  ((c1 & 15) << 12) | ((c2 & 63) << 6) | (c3 & 63)
  );
  i += 3;
 }
 }
 return tmp_arr.join("");
}

以下是Puxiao投稿推荐的几个函数,用作常见的输入值校验和替换操作,主要针对中国大陆地区的校验规则:

校验是否为一个数字,以及该数字小数点位数是否与参数floats一致

校验规则:

  • 若参数floats有值,则校验该数字小数点后的位数。
  • 若参数floats没有值,则仅仅校验是否为数字。
function isNum(value,floats=null){
 let regexp = new RegExp(`^[1-9][0-9]*.[0-9]{${floats}}$|^0.[0-9]{${floats}}$`);
 return typeof value === 'number' && floats?regexp.test(String(value)):true;
}
function anysicIntLength(minLength,maxLength){
 let result_str = '';
 if(minLength){
  switch(maxLength){
   case undefined:
    result_str = result_str.concat(`{${minLength-1}}`);
    break;
   case null:
    result_str = result_str.concat(`{${minLength-1},}`);
    break;
   default:
    result_str = result_str.concat(`{${minLength-1},${maxLength-1}}`);
  }
 }else{
  result_str = result_str.concat('*');
 }

 return result_str;
}

校验是否为非零的正整数

function isInt(value,minLength=null,maxLength=undefined){
 if(!isNum(value)) return false;

 let regexp = new RegExp(`^-?[1-9][0-9]${anysicIntLength(minLength,maxLength)}$`);
 return regexp.test(value.toString());
}

校验是否为非零的正整数

function isPInt(value,minLength=null,maxLength=undefined) {
 if(!isNum(value)) return false;

 let regexp = new RegExp(`^[1-9][0-9]${anysicIntLength(minLength,maxLength)}$`);
 return regexp.test(value.toString());
}

校验是否为非零的负整数

function isNInt(value,minLength=null,maxLength=undefined){
 if(!isNum(value)) return false;
 let regexp = new RegExp(`^-[1-9][0-9]${anysicIntLength(minLength,maxLength)}$`);
 return regexp.test(value.toString());
}

校验整数是否在取值范围内

校验规则:

  • minInt为在取值范围中最小的整数
  • maxInt为在取值范围中最大的整数
function checkIntRange(value,minInt,maxInt=9007199254740991){
 return Boolean(isInt(value) && (Boolean(minInt!=undefined && minInt!=null)?value>=minInt:true) && (value<=maxInt));
}

校验是否为中国大陆手机号

function isTel(value) {
 return /^1[3,4,5,6,7,8,9][0-9]{9}$/.test(value.toString());
}

校验是否为中国大陆传真或固定电话号码

function isFax(str) {
 return /^([0-9]{3,4})?[0-9]{7,8}$|^([0-9]{3,4}-)?[0-9]{7,8}$/.test(str);
}

校验是否为邮箱地址

function isEmail(str) {
 return /^[a-zA-Z0-9_-]+@[a-zA-Z0-9_-]+(\.[a-zA-Z0-9_-]+)+$/.test(str);
}

校验是否为QQ号码

校验规则:

  • 非0开头的5位-13位整数
function isQQ(value) {
 return /^[1-9][0-9]{4,12}$/.test(value.toString());
}

校验是否为网址

校验规则:

  • https://、http://、ftp://、rtsp://、mms://开头、或者没有这些开头
  • 可以没有www开头(或其他二级域名),仅域名
  • 网页地址中允许出现/%*?@&等其他允许的符号
function isURL(str) {
 return /^(https:\/\/|http:\/\/|ftp:\/\/|rtsp:\/\/|mms:\/\/)?[a-zA-Z0-9_-]+(\.[a-zA-Z0-9_-]+)+[\/=\?%\-&_~`@[\]\':+!]*([^<>\"\"])*$/.test(str);
}

校验是否为不含端口号的IP地址

校验规则:

  • IP格式为xxx.xxx.xxx.xxx,每一项数字取值范围为0-255
  • 除0以外其他数字不能以0开头,比如02
function isIP(str) {
 return /^((25[0-5]|2[0-4][0-9]|1[0-9]{2}|[1-9]?[0-9])\.){3}(25[0-5]|2[0-4][0-9]|1[0-9]{2}|[1-9]?[0-9])$/.test(str);
}

校验是否为IPv6地址

校验规则:

  • 支持IPv6正常格式
  • 支持IPv6压缩格式
function isIPv6(str){
 return Boolean(str.match(/:/g)?str.match(/:/g).length<=7:false && /::/.test(str)?/^([\da-f]{1,4}(:|::)){1,6}[\da-f]{1,4}$/i.test(str):/^([\da-f]{1,4}:){7}[\da-f]{1,4}$/i.test(str));
}

校验是否为中国大陆第二代居民身份证

校验规则:

  • 共18位,最后一位可为X(大小写均可)
  • 不能以0开头
  • 出生年月日会进行校验:年份只能为18/19/2*开头,月份只能为01-12,日只能为01-31
function isIDCard(str){
 return /^[1-9][0-9]{5}(18|19|(2[0-9]))[0-9]{2}((0[1-9])|(10|11|12))(([0-2][1-9])|10|20|30|31)[0-9]{3}[0-9Xx]$/.test(str);
}

校验是否为中国大陆邮政编码

参数value为数字或字符串

校验规则:

  • 共6位,且不能以0开头
function isPostCode(value){
 return /^[1-9][0-9]{5}$/.test(value.toString());
}

校验两个参数是否完全相同,包括类型

校验规则:

  • 值相同,数据类型也相同
function same(firstValue,secondValue){
 return firstValue===secondValue;
}

校验字符的长度是否在规定的范围内

校验规则:

  • minInt为在取值范围中最小的长度
  • maxInt为在取值范围中最大的长度
function lengthRange(str,minLength,maxLength=9007199254740991) {
 return Boolean(str.length >= minLength && str.length <= maxLength);
}

校验字符是否以字母开头

校验规则:

  • 必须以字母开头
  • 开头的字母不区分大小写
function letterBegin(str){
 return /^[A-z]/.test(str);
}

校验字符是否为纯数字(整数)

校验规则:

  • 字符全部为正整数(包含0)
  • 可以以0开头
function pureNum(str) {
 return /^[0-9]*$/.test(str);
}
function anysicPunctuation(str){
 if(!str) return null;
 let arr = str.split('').map(item => {
  return item = '\\' + item;
 });
 return arr.join('|');
}
function getPunctuation(str){
 return anysicPunctuation(str) || '\\~|\\`|\\!|\\@|\\#|\\$|\\%|\\^|\\&|\\*|\\(|\\)|\\-|\\_|\\+|\\=|\\||\\\|\\[|\\]|\\{|\\}|\\;|\\:|\\"|\\\'|\\,|\\<|\\.|\\>|\\/|\\?';
}
function getExcludePunctuation(str){
 let regexp = new RegExp(`[${anysicPunctuation(str)}]`,'g');
 return getPunctuation(' ~`!@#$%^&*()-_+=\[]{};:"\',<.>/?'.replace(regexp,''));
}

返回字符串构成种类(字母,数字,标点符号)的数量

LIP缩写的由来:L(letter 字母) + I(uint 数字) + P(punctuation 标点符号)

参数punctuation的说明:

  • punctuation指可接受的标点符号集
  • 若需自定义符号集,例如“仅包含中划线和下划线”,将参数设置为"-_"即可
  • 若不传值或默认为null,则内部默认标点符号集为除空格外的其他英文标点符号:~`!@#$%^&*()-_+=[]{};:"',<.>/?
function getLIPTypes(str,punctuation=null){
 let p_regexp = new RegExp('['+getPunctuation(punctuation)+']');
 return /[A-z]/.test(str) + /[0-9]/.test(str) + p_regexp.test(str);
}

校验字符串构成的种类数量是否大于或等于参数num的值。 通常用来校验用户设置的密码复杂程度。

校验规则:

  • 参数num为需要构成的种类(字母、数字、标点符号),该值只能是1-3。
  • 默认参数num的值为1,即表示:至少包含字母,数字,标点符号中的1种
  • 若参数num的值为2,即表示:至少包含字母,数字,标点符号中的2种
  • 若参数num的值为3,即表示:必须同时包含字母,数字,标点符号
  • 参数punctuation指可接受的标点符号集,具体设定可参考getLIPTypes()方法中关于标点符号集的解释。
function pureLIP(str,num=1,punctuation=null){
 let regexp = new RegExp(`[^A-z0-9|${getPunctuation(punctuation)}]`);
 return Boolean(!regexp.test(str) && getLIPTypes(str,punctuation)>= num);
}

清除所有空格

function clearSpaces(str){
 return str.replace(/[ ]/g,'');
}

清除所有中文字符(包括中文标点符号)

function clearCNChars(str){
 return str.replace(/[\u4e00-\u9fa5]/g,'');
}

清除所有中文字符及空格

function clearCNCharsAndSpaces(str){
 return str.replace(/[\u4e00-\u9fa5 ]/g,'');
}

除保留标点符号集以外,清除其他所有英文的标点符号(含空格)

全部英文标点符号为: ~`!@#$%^&*()-_+=[]{};:"',<.>/?

参数excludePunctuation指需要保留的标点符号集,例如若传递的值为'_',即表示清除_以外的其他所有英文标点符号。

function clearPunctuation(str,excludePunctuation=null){
 let regexp = new RegExp(`[${getExcludePunctuation(excludePunctuation)}]`,'g');
 return str.replace(regexp,'');
}

校验是否包含空格

function haveSpace(str) {
 return /[ ]/.test(str);
}

校验是否包含中文字符(包括中文标点符号)

function haveCNChars(str){
 return /[\u4e00-\u9fa5]/.test(str);
}

感兴趣的朋友可以使用在线HTML/CSS/JavaScript代码运行工具http://tools.jb51.net/code/HtmlJsRun测试上述代码运行效果。

更多关于JavaScript相关内容可查看本站专题:《JavaScript常用函数技巧汇总》、《javascript面向对象入门教程》、《JavaScript错误与调试技巧总结》、《JavaScript数据结构与算法技巧总结》及《JavaScript数学运算用法总结

希望本文所述对大家JavaScript程序设计有所帮助。

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