ie和谷歌添加事件的处理策略

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<!doctype html><html lang="en"><head>    <meta charset="UTF-8">    <title>Document</title></head><body><button id="btn">点我</button><script>    function aaa() {        alert('a')    }    function bbb() {        alert('b')    }    function myAddEvent(obj, sEvent, fn) {        if (obj.attachEvent) {            obj.attachEvent("on" + sEvent, fn)        } else {            obj, addEventListener(sEvent, fn, false)        }    }    window.onload = function () {        var btn = document.getElementById("btn");        myAddEvent(btn, 'click', aaa);        myAddEvent(btn, 'click', bbb)    }</script></body></html>
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