js--小结⑥---typeof

2022-02-20 06:36:12

 <!DOCTYPE html>

 <html lang="en">

 <head>

     <meta charset="UTF-8">

     <title>Document</title>

 </head>

 <body>

     <p>typeof操作符返回变量或者表达式的类型</p>

     <p id="demo"></p>

     <script>

     document.getElementById("demo").innerHTML=

     typeof "john"+"<br />"+

     typeof "3.14"+"<br />"+

     typeof false+"<br />"+

     typeof [1,2,3,4]+"<br />"+

     typeof{name:' john',age:34};

     </script>

 </body>

 </html>

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