js

<html>
<head>
<script type="text/javascript" src="common.js">
     document.write("inner");
</script>
<script type="text/javascript">
     var x=1;
     var str01='abc';
     var str02="def";
     //alert(typeof x);
      alert(typeof str01);
     //console.log(typeof x);
</script>
</head>
<body>

</body>  
</html>

首先在js中""和‘’是没有区别的,typeof能返回该对象的类型

原文地址:https://www.cnblogs.com/lonecloud/p/5487940.html