【DOM编程艺术】window.onload延伸addLoadEvent 

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>addLoadEvent</title>
</head>

<body>
<script type="text/javascript">addLoadEvent(firstFunction);
addLoadEvent(secondFunction);
function firstFunction(){
    alert('我是第一个函数');
}
function secondFunction(){
    alert('我是需要加载的第二个函数');
}
function addLoadEvent(func){
    var oldonload=window.onload;  //把现有的window.onload事件处理函数的值存入变量oldonload
    if(typeof window.onload !='function'){
        window.onload=func;
    }else{
        window.onload=function(){
            oldonload();
            func();
        }
    }
    
}
</script>
</body>
</html>

 

posted @ 2014-04-13 17:29  Western Journey  阅读(149)  评论(0)    收藏  举报