es6 新的数据类型Map键值对

版权声明：== https://github.com/fyonecon == https://blog.csdn.net/weixin_41827162/article/details/82781796

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Map与数组字典有相似性，如下：

        let array = [
            {
                type:'text',
                content:'abcdefg',
            },
            {
                type:'number',
                content:'12345678',
            },
        ];

操作Map，如下：

        let map = new Map([
            ["one", 1],
            ["two", 2],
        ]);
        map.set("one", 11); map.set("two2", 2); map.set("three", 3); // 添加或者更新Map键值对

        console.log(map);
        console.log(typeof map);
        console.log(map.size);
        console.log(map.get("one"));
        console.log(map.has("one"));
        for (let key of map.keys()){
            console.log(key);
        }
        for (let value of map.values()){
            console.log(value);
        }
        for (let [key, value] of map){
            console.log(key + "-" + value);
        }

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