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javascript ʼþ¿Ø¹Ü問題?

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  ¼Ù設ÎÒÓÐ10個圖ÐÎÒªÔÚ網頁ÉÏÄÜ夠×ÔÓɵر»ÍÏÒ·ÒÆ動. ÎÒ試ÁË兩種·½·¨ÈçÏÂ. ÎÒÏë請問為ºÎ兩種·½Ê½ÔÚ»¬ÊóÍÏÒ·圖Ƭ時µÄЧÄÜ會²î這麼¶à? ·½·¨1µÄЧÄܱȷ½·¨2²î許¶à, ²»Öª問題³öÔÚÄÄ? 請幫幫æ, Ö¸½Ì¸ü¾«簡¸üÓÐЧÂʵÄ×ö·¨. 謝謝!!
1. 設¶¨ºÃaddEventHandler, 這10個圖Ðζ¼È¥ºô½ÐËü, shareͬһ個mousedown, mouseup, mousemove. ÓÃtarget.addEventListener來觸發ʼþº¯Ê½.
    problem: »¬ÊóÖ»ÄÜÂýÂýÒÆ動, ·ñ則圖ÐÎ來²»¼°偵測mouseup¶ø³ö現圖ÐÎ亂飄(應該ÊÇÒò為mousemoveµÄlistenerÈÔÔÚ×÷ÓÃ).
    ----------------------------------------------------
    for(var i=0;i <GroupID02.childNodes.length;i++){
    if(GroupID02.childNodes[i].id){
    addEventHandler(GroupID02.childNodes[i],"mousedown",mousedown_listener);
    }
    }
    function addEventHandler(target, type, func) {
    if (target.addEventListener)
    target.addEventListener(type, func, true);
    else if (target.attachEvent)
    target.attachEvent("on" + type, func);
    else target["on"


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