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- <!DOCTYPE html>
- <html lang="en">
- <head>
- <meta charset="UTF-8">
- <meta http-equiv="X-UA-Compatible" content="IE=edge">
- <meta name="viewport" content="width=device-width, initial-scale=1.0">
- <title>Document</title>
- </head>
- <body>
- <script>
- //基本数据类型： number srting boolean null undefined
- //引用数据类型： object
- /* var a = 3;
- b = a
- b = 4
- console.log(a)
- console.log(b) */
- /* var c = [1,2,3,4,5]
- d = c
- d[1] = 20
- console.log(c)
- console.log(d) */
- /* var n = {
- name: 'zs',
- age: 20
- }
- m = n
- m.name = 'lisi'
- console.log(n)
- console.log(m) */
- var a = 3
- function num(){
- console.log(a)
- var a = 4
- console.log(a)
- }
- console.log(a)
- num()
- console.log(a)
- var b = 3
- function num(){
- console.log(b)
- b = 4
- console.log(b)
- }
- console.log(b)
- num()
- console.log(b)
- </script>
- </body>
- </html>
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