javaScript-studycode/javascript/Map_Set.html at master · codebear2/javaScript-studycode

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<!DOCTYPE html>

<head>

<title>Map和set</title>

</head>

<body>

'use strict'

// Map

let f = new Map([['jack',100],['rose',90],['tom',80]]);

// 通过key 找到对应的 value

let name =f.get('jack');

console.log(name);

// 添加键值对

f.set('lucy',50);

console.log(f);

// 删除元素

f.delete('jack');

console.log(f);

// Set 可以去重

let s = new Set([3,1,1,1,1]);

// [3,1]

// 添加元素

s.add(2);

console.log(s);

// 删除元素

s.delete(1);

console.log(s);

// 查找元素

console.log(s.has(3)); // 返回ture

</script>

</body>

</html>

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