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為什么跨瀏覽器事件處理程序不能執(zhí)行?

為什么跨瀏覽器事件處理程序不能執(zhí)行?

wanoneQ 2016-02-18 13:19:14
<!DOCTYPE html><html><head>?? ?<title>20160217</title></head><body>?? <input type="button" value="按鈕" id="btn">?? <script type="text/javascript">?? var eventUtil={? ??? ?addHandler:function(element,type,handler){? ??? ??? ?if (element.addEventListener){? ??? ??? ??? ?element.addEventListener(type,handler,false);? ??? ??? ?}else if(element.attachEvent){? ??? ??? ??? ?element.attachEvent("on"+type,handler);? ??? ??? ?}else {? ??? ??? ??? ?element["on"+type]=handler;? ??? ??? ?}? ??? ?}? ??? ?removeHandler:function (element,type,handler){? ??? ??? ?if (element.removeEventListener){? ??? ??? ??? ?element.removeEventListener(type,handler,false);? ??? ??? ?}else if(element.detachEvent){? ??? ??? ??? ?element.detachEvent("on"+type,handler);? ??? ??? ?}else {? ??? ??? ??? ?element["on"+type]=null;? ??? ??? ?}? ??? ?}?? }?? var btn=document.getElementById("btn");?? eventUtil.addHandler(btn,"click",show);?? function show(){? ??? ?alert("hello");?? }?? </script></body></html>
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?
李曉健

TA貢獻(xiàn)1036條經(jīng)驗(yàn) 獲得超461個(gè)贊

var?eventUtil={
????addHandler:function(element,type,handler){
????????if?(element.addEventListener){
????????????element.addEventListener(type,handler,false);
????????}else?if(element.attachEvent){
????????????element.attachEvent("on"+type,handler);
????????}else?{
????????????element["on"+type]=handler;
????????}
????},?//這里少了一個(gè)逗號(hào)
????removeHandler:function?(element,type,handler){
????????if?(element.removeEventListener){
????????????element.removeEventListener(type,handler,false);
????????}else?if(element.detachEvent){
????????????element.detachEvent("on"+type,handler);
????????}else?{
????????????element["on"+type]=null;
????????}
????}
}


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