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FireFox : addEventListener()·½·¨ IE : attachEvent()·½·¨ ΪHTMLÔªËØÌí¼ÓÒ»¸öʼþ¼àÌý, ¶ø²»ÊÇÖ±½Ó¶ÔÔªËØµÄʼþÊôÐÔ£¨È磺onclick¡¢onmouseover£©¸³Öµ¡£ ÕâÁ½ÖÖ·½·¨´¦Àíʼþ»¹ÊÇÓкܴóÇø±ðµÄ£¡Ê¼þÊôÐÔÖ»Äܸ³ÖµÒ»ÖÖ·½·¨£¬¼´£º button1.onclick = function() { alert(1); };
button1.onclick = function() { alert(2); };
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///
/// Ìí¼Óʼþ¼àÌý
///
/// ÔØÌå
/// ʼþÀàÐÍ
/// ʼþº¯Êý
function addEventHandler(target, type, func) {
    if (target.addEventListener)
        target.addEventListener(type, func, false);
    else if (target.attachEvent)
        target.attachEvent("on" + type, func);
    else target["on" + type] = func;
} ///
/// ÒÆ³ýʼþ¼àÌý
///
/// ÔØÌå
/// ʼþÀàÐÍ
/// ʼþº¯Êý
function removeEventHandler(target, type, func) {
    if (target.removeEventListener)
        target.removeEventListener(type, func, false);
    else if (target.detachEvent)
        target.detachEvent("on" + type, func);
    else delete target["on" + type];
} var Button1 = document.getElementById("Button1");
var Button1Click = function() { alert(1); };
addEventHandler(Button1, "click",  Button1Click);
addEventHandler(Button1, "click", function() { alert(2); } );
addEventHandler(Button1, "click", function() { alert(3); } ); removeEventHandler(Button1, "click", function() { alert(2); } ); // ÒÆ²»³ö
removeEventHandler(Button1, "click", Button1Click); // ¿ÉÒÔÒÆ³ý



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