lovecoding
/
class


			
				
					
						
						
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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>
    <script>
        // Map对象
        let s1 = new Map();
        console.log(s1);
        // 设置
        s1.set("name","孙悟空");
        s1.set("age",18);
        console.log(s1);
        // 获取
        console.log(s1.get("name"));
        // 删除
        // console.log(s1.delete("name"));
        // s1.delete("name")
        // size 获取当前map对象长度
        // console.log(s1.size);
        // clear 清空全部
        s1.clear();
        console.log(s1);
        // 数据循环 对已有数组进行操作
        var arr = [12,21,23,45,32,3];
        arr.map((ele,index) => {
            console.log(ele,index);
        })
        var s2 = new Map();
        s2.set("name","猪八戒");
        s2.set("age",22);
        console.log(s2);
        // key 每一项键值对
        for (var key of s2) {
            console.log(key,'s2')
        }
        // keys() 每一项可枚举属性名
        for(var a of s2.keys()) {
            console.log(a,'keys');
        }
        // values() 每一项可枚举属性值
        for(var a of s2.values()) {
            console.log(a,'values');
        }
        // entries() 每一项可枚举的键值对
        for(var a of s2.entries()) {
            console.log(a,'entries');
        }
    </script>
</body>
</html>