MOOC上显示不出，提取出来，本地可以打开？
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>window对象</title>
<script type="text/javascript">
function a(){
var a = confirm("是否打开网站？");
if(a == true){
window.open('http://www.imooc.com' , '_blank' , 'width=600px heigh=400px');
}
else{
alert("打开错误~~")
}
}
</script>
</head>
<body>
<form>
<input type="button" value="点击我，打开新窗口" onClick="a()"/>
</form>
</body>
</html>
