es6之Map（3）

比眉伴天荒 2022-03-27 09:24 318阅读 0赞

写在开始的题外话：大佬晚上说测试，没错，就是晚上╮(╯▽╰)╭

翻翻记录，大佬曾说一般开发流程是：需求收集-》需求确定-》需求评审-》技术方案落地-》开发-》自测-》冒烟测试-》提测-》测试介入测试-》UT和showcase（就是产品和业务员验收用例的意思）-》发布上线

突然想到这算不算加班？！

**Set类似于数组，而Map就类似于键值对（Key, Value）；**

ES6 提供了 Map 数据结构。它类似于对象，也是键值对的集合，但是“键”的范围不限于字符串，各种类型的值（包括对象）都可以当作键。

var m = new Map([["name","panzina"]]);
    console.log(m);

![20190122220839949.png][]

### 一.查 ###

var m = new Map([["name","panzina"]]);
    console.log(m.get("name"));
    
    //结果：panzina

### 二.增 ###

var m = new Map([["name","panzina"]]);
    m.set("age",100);
    console.log(m);

![20190122221302203.png][]

**用对象作为另一个对象的key**

var m = new Map([["name","panzina"]]);
    var momo = {name:'m'}
    m.set(momo,1)
    console.log(m);

![20190122221718346.png][]

### 三、删 ###

var m = new Map([["name","panzina"]]);
    var momo = {name:'m'}
    m.set(momo,1)
    m.delete(momo);
    console.log(m);

### 四、判断是否是在has ###

var m = new Map([["name","panzina"]]);
    var momo = {name:'m'}
    m.set(momo,1)
    console.log(m.has(momo));
    
    //结果：true

### 五、清除clear ###

var m = new Map([["name","panzina"]]);
    var momo = {name:'m'}
    m.set(momo,1)
    m.clear();
    console.log(m);
    
    //结果：Map(0) {}

### 六、foreach ###

var m = new Map([["name","panzina"],["aaa","111"]]);
    var momo = {name:'m'}
    m.set(momo,1)
    m.forEach(function (item,key,map) {
       console.log(item,key,map)
    })

![20190122224418340.png][]

### 七、key ###

var m = new Map([["name","panzina"],["aaa","111"]]);
    var momo = {name:'m'}
    m.set(momo,1)
    var res = m.keys();
    console.log(res.next());
    console.log(res.next());
    console.log(res.next());
    console.log(res.next());

### 八、values ###

var m = new Map([["name","panzina"],["aaa","111"]]);
    var momo = {name:'m'}
    m.set(momo,1)
    var res = m.values();
    console.log(res.next());
    console.log(res.next());
    console.log(res.next());
    console.log(res.next());

![20190122224737150.png][]

### 九、entries ###

var m = new Map([["name","panzina"],["aaa","111"]]);
    var momo = {name:'m'}
    m.set(momo,1)
    var res = m.entries();
    console.log(res.next());
    console.log(res.next());
    console.log(res.next());
    console.log(res.next());

![20190122224916468.png][]

[20190122220839949.png]: /images/20220327/feaada4d1335442b9ac3fcf81472d43e.png
[20190122221302203.png]: /images/20220327/4915af4899df48f1a53bca025508c0ca.png
[20190122221718346.png]: /images/20220327/352c3bb16406489e8212c3bd8fdfe896.png
[20190122224418340.png]: /images/20220327/d1e2f9f0b40649a6abd42fef38034ceb.png
[20190122224737150.png]: /images/20220327/4b6f87a940e5406f807b53d199370ae2.png
[20190122224916468.png]: /images/20220327/0c3bcafdb80a4500908a1f23902f9bed.png