这什么反应都没有,大佬帮忙看看
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>window对象</title>
<script type="text/javascript">
alert("欢迎来到慕课网!");
function openWindow(){
window.open("https://www.imooc.com/" "_block" "width=600px,height=400px")
}
</script>
</head>
<body>
<form>
<input type="button" value="点击我,打开新窗口" onclick="openWindow()"/>
</form>
</body>
</html>