<!DOCTYPE html><html><head>?? ?<meta charset="utf-8">?? ?<title>跨瀏覽器支持</title>?? ?<script type="text/javascript">?? ???? var btn=document.getElementById('btn');?? ??? ?function showMes() {?? ??? ??? ?alert("hello world");?? ??? ?}?? ??? ?var EventUtill={?? ??? ??? ?addHander:function (elment,type,hander) {?? ??? ??? ??? ?if (elment.addEventListener) {?? ??? ??? ??? ??? ?elment.addEventListener(type,hander,false);?? ??? ??? ??? ?} else if(elment.attachEvent){?? ??? ??? ??? ??? ?elment.attachEvent('on'+type,hander);?? ??? ??? ??? ?}else{?? ??? ??? ??? ??? ?elment['on'+type]=hander;?? ??? ??? ??? ?}// body...?? ??? ??? ?},?? ??? ??? ?removeHander:function (elment,type,hander) {?? ??? ??? ??? ?if (elment.removeEventListener) {?? ??? ??? ??? ??? ?elment.removeEventListener(type,hander,false);?? ??? ??? ??? ?} else if(elment.detachEvent){?? ??? ??? ??? ??? ?elment.detachEvent('on'+type,hander);?? ??? ??? ??? ?}else{?? ??? ??? ??? ??? ?elment['on'+type]=null;?? ??? ??? ??? ?}// body...?? ??? ??? ?}?? ??? ?}?? ??? ?EventUtill.addHander(btn,'click',showMes)； ?? ?</script></head><body>????<input type="button" id="btn" value="按鈕"></body></html>
為什么將script代碼放在head標簽中就實現(xiàn)不了跨瀏覽器支持？
長弓忌
2016-07-09 22:59:49
