一、基本数据类型

1.number

 1 <!DOCTYPE html>
 2 <html lang="en">
 3 <head>
 4     <meta charset="UTF-8">
 5     <title>流浪者</title>
 6     <style>
 7         div{
 8             font-size: 40px;
 9             font-weight: bold;
10             font-family: "华文行楷";
11         }
12     </style>
13 
14 </head>
15 <body>
16 
17 <script>
18     var a = 1;
19     console.log(typeof a);
20     var b = 5/0;
21     console.log(b);
22     console.log(typeof b);
23 </script>
24 
25 <div>流浪者流浪者</div>
26     
27 </body>
28 </html>

2.string

 1 <!DOCTYPE html>
 2 <html lang="en">
 3 <head>
 4     <meta charset="UTF-8">
 5     <title>流浪者</title>
 6     <style>
 7         div{
 8             font-size: 40px;
 9             font-weight: bold;
10             font-family: "华文行楷";
11         }
12     </style>
13 
14 </head>
15 <body>
16 
17 <script>
18     var str = '123';
19     console.log(typeof str);
20 </script>
21 
22 <div>流浪者流浪者</div>
23     
24 </body>
25 </html>

3.boolean

 1 <!DOCTYPE html>
 2 <html lang="en">
 3 <head>
 4     <meta charset="UTF-8">
 5     <title>流浪者</title>
 6     <style>
 7         div{
 8             font-size: 40px;
 9             font-weight: bold;
10             font-family: "华文行楷";
11         }
12     </style>
13 
14 </head>
15 <body>
16 
17 <script>
18     var b = false;
19     console.log(typeof b);
20 </script>
21 
22 <div>流浪者流浪者</div>
23     
24 </body>
25 </html>

4.null

 1 <!DOCTYPE html>
 2 <html lang="en">
 3 <head>
 4     <meta charset="UTF-8">
 5     <title>流浪者</title>
 6     <style>
 7         div{
 8             font-size: 40px;
 9             font-weight: bold;
10             font-family: "华文行楷";
11         }
12     </style>
13 
14 </head>
15 <body>
16 
17 <script>
18     var c = null;
19     console.log(typeof c);
20 </script>
21 
22 <div>流浪者流浪者</div>
23     
24 </body>
25 </html>

5.undefined

 1 <!DOCTYPE html>
 2 <html lang="en">
 3 <head>
 4     <meta charset="UTF-8">
 5     <title>流浪者</title>
 6     <style>
 7         div{
 8             font-size: 40px;
 9             font-weight: bold;
10             font-family: "华文行楷";
11         }
12     </style>
13 
14 </head>
15 <body>
16 
17 <script>
18     var d;
19     console.log(typeof d);
20 </script>
21 
22 <div>流浪者流浪者</div>
23     
24 </body>
25 </html>

二、引用数据类型

1.Function

2.Object

3.Array

4.String

5.Date

作者：流浪者

日期：2019-09-03


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