兼容ie9不支持classList问题

网上有很多处理方案，大部分我试了都不起作用，在此记录一下我自己项目解决成功的方案。

原git项目地址：https://github.com/jwilsson/domtokenlist/blob/master/dist/domtokenlist.js

使用：下载domtokenlist.js,在ie9中引入domtokenlist.js即可

/*! DOMTokenlist shim | Copyright 2016 Jonathan Wilsson and Bogdan Chadkin. */;typeof window !== 'undefined' && (function (window) { 'use strict'; if (!window.DOMTokenList) { return; } var el = document.createElement('a').classList; var dtp = DOMTokenList.prototype; var add = dtp.add; var remove = dtp.remove; var toggle = dtp.toggle; el.add('c1', 'c2'); // Older versions of the HTMLElement.classList spec didn't allow multiple // arguments, easy to test for var iterateArg = function (fn) { return function () { var tokens = arguments; var i; for (i = 0; i < tokens.length; i += 1) { fn.call(this, tokens[i]); } }; }; if (!el.contains('c2')) { dtp.add = iterateArg(add); dtp.remove = iterateArg(remove); } // Older versions of the spec didn't have a forcedState argument for // `toggle` either, test by checking the return value after forcing if (!el.toggle('c1', true)) { dtp.toggle = function (cls, force) { if (force === undefined) { return toggle.call(this, cls); } (force ? add : remove).call(this, cls); return !!force; }; }}(window)); ;typeof window !== 'undefined' && (function (window) { 'use strict'; var arr = []; var inArray = function (array, value) { var i; if (arr.indexOf) { return arr.indexOf.call(array, value); } for (i = 0; i < array.length; i++) { if (array[i] === value) { return i; } } return -1; }; var validateToken = function (token) { var whitespace = /[\u0009\u000A\u000C\u000D\u0020]/; if (token === '' || whitespace.test(token)) { throw new Error('Token must not be empty or contain whitespace.'); } }; var DOMTokenList = function (element, prop) { var inst = this; var i; var values = []; if (element && prop) { inst.element = element; inst.prop = prop; if (element[prop]) { values = element[prop].replace(/^\s+|\s+$/g, '').split(/\s+/); for (i = 0; i < values.length; i++) { inst[i] = values[i]; } } } inst.length = values.length; }; DOMTokenList.prototype = { add: function () { var inst = this; var i; var tokens = arguments; for (i = 0; i < tokens.length; i++) { validateToken(tokens[i]); if (!inst.contains(tokens[i])) { arr.push.call(inst, tokens[i]); } } if (inst.element) { inst.element[inst.prop] = inst; } }, contains: function (token) { validateToken(token); return inArray(this, token) !== -1; }, item: function (index) { return this[index] || null; }, remove: function () { var tokens = arguments; var inst = this; var key; var i; for (i = 0; i < tokens.length; i++) { validateToken(tokens[i]); key = inArray(inst, tokens[i]); if (key !== -1) { arr.splice.call(inst, key, 1); } } if (inst.element) { inst.element[inst.prop] = inst; } }, toggle: function (token, force) { var inst = this; if (inst.contains(token)) { if (force) { return true; } inst.remove(token); return false; } else { if (force === false) { return false; } inst.add(token); return true; } }, toString: function () { return arr.join.call(this, ' '); } }; window.DOMTokenList = DOMTokenList;}(window)); ;typeof window !== 'undefined' && (function () { 'use strict'; if ('classList' in document.createElement('a')) { return; } Object.defineProperty(Element.prototype, 'classList', { get: function () { return new DOMTokenList(this, 'className'); } });}()); ;typeof window !== 'undefined' && (function () { 'use strict'; if ('relList' in document.createElement('a')) { return; } var i; var elements = [HTMLAnchorElement, HTMLAreaElement, HTMLLinkElement]; var getter = function () { return new DOMTokenList(this, 'rel'); }; for (i = 0; i < elements.length; i++) { Object.defineProperty(elements[i].prototype, 'relList', { get: getter }); }}()); ;typeof window !== 'undefined' && (function () { 'use strict'; if (typeof SVGElement === 'undefined') { // IE8 does not support SVG and would throw // "Object doesn't support this method or property" return; } // https://connect.microsoft.com/IE/feedback/details/1046039/classlist-not-working-on-svg-elements var svg = document.createElementNS("http://www.w3.org/2000/svg", "svg"); if ('classList' in svg && !window.QUnit) { return; } Object.defineProperty(SVGElement.prototype, 'classList', { get: function () { if (typeof this.className === 'string') { return new DOMTokenList(this, 'className'); } // in SVG world className may not be a DOMString, but a SVGAnimatedString // https://developer.mozilla.org/en-US/docs/Web/API/SVGAnimatedString if (typeof this.className.baseVal === 'string') { return new DOMTokenList(this.className, 'baseVal'); } } });}());