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- <!DOCTYPE html>
- <html lang="en">
- <head>
- <meta charset="UTF-8">
- <meta name="viewport" content="width=device-width, initial-scale=1.0">
- <title>Document</title>
- </head>
- <body>
- <!--
- map 类似于对象 键值对中的对象
- set() 设置集合中的键值对
- get() 获取集合中键值对属性值
- has() 查找集合中的属性是否存在
- clear() 清空集合
- -->
- <script>
- let m1 = new Map();
- console.log(m1);
- let m2 = new Map([
- ["name","Tom"],
- ["age","10"]
- ])
- console.log(m2);
- m2.set("sex","男")
- console.log(m2.get("name"));
-
- console.log(m2.has("age1"));
- // m2.clear()
- console.log(m2);
- let list = [34,45,56,67,78];
- list.map((ele,index)=>{
- console.log(ele,'a',index)
- })
- for(let k of m2.keys()) {
- console.log(k)
- }
- for(let k of m2.values()) {
- console.log(k)
- }
- for(let k of m2.entries()) {
- console.log(k)
- }
- </script>
- </body>
- </html>
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