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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>
- // var obj = {
- // name:'zs'
- // }
- // var a1 = new Map()
- // console.log(a1)
- // a1.set('age',20)
- // console.log(a1)
- // a1.set(obj,'aaa')
- // console.log(a1)
- // a1.set('name','zs')
- // console.log(a1)
- /*
- map
- 1.可以使用任何数据类型作为键值
- 2.方法：
- set(key,value)向Map中添加一个键值对
- get(key)根据键获取对应的值
- has(Key)判断Map中是否存在指定的值
- delete(key)根据键删除对应的键值对
- clear()清空Map中所有的键值对
- size()获取Map中键值对的数量
- */
- let map = new Map()
- map.set('name','zs')
- map.set('age',30)
- map.set(true,'yes')
- console.log(map.get('name'))//输出为zs
- console.log(map.has('age'))//输出为true
- console.log(map.size)//输出为3
- map.delete(true)
- console.log(map.size)//输出为2
- map.clear()
- console.log(map.size)//输出为0
- </script>
- </body>
- </html>
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