iframe 在chrome 下会重复请求
<!DOCTYPE HTML>
<html>
<head>
<meta charset="utf-8">
<title>iframe的onload在Chrome/Opera中执行两次</title>
</head>
<body>
</body>
<script>
var iframe = document.createElement('iframe');
iframe.scrolling = "no";
iframe.frameBorder=0;
iframe.width=680;
iframe.height=560;
document.body.appendChild(iframe);
setTimeout(function (){
iframe.src= 'http://www.baidu.com?sdfj=jfsdkj';
},300)
</script>
</html>
