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ES6参考---对象扩展

ES6参考---对象扩展

一、总结

一句话总结:

1、Object.is(v1, v2):判断2个数据是否完全相等,字符串方式比较
2、Object.assign(target, source1, source2..):将源对象的属性复制到目标对象上
3、对象直接操作 __proto__ 属性:let obj2 = {};obj2.__proto__ = obj1;
<script type="text/javascript">

    console.log(Object.is('abc', 'abc'));//true
    console.log(NaN == NaN);//false
    console.log(Object.is(NaN, NaN));//true

    console.log(0 == -0);//true
    console.log(Object.is(0, -0));//false

    //Object.assign(target, source1, source2..)
    let obj = {name : 'kobe', age : 39, c: {d: 2}};
    let obj1 = {};
    Object.assign(obj1, obj);
    console.log(obj1, obj1.name);

    //直接操作 __proto__ 属性
    let obj3 = {name : 'anverson', age : 41};
    let obj4 = {};
    obj4.__proto__ = obj3;
    console.log(obj4, obj4.name, obj4.age);
  
</script>

 

 

1、Object.assign(target, source1, source2..):将源对象的属性复制到目标对象上?

将obj的属性给obj1:Object.assign(obj1, obj);
//Object.assign(target, source1, source2..)
let obj = {name : 'kobe', age : 39, c: {d: 2}};
let obj1 = {};
Object.assign(obj1, obj);
console.log(obj1, obj1.name);

 

 

2、对象直接操作 __proto__ 属性?

对象可以直接通过 __proto__ 属性 来操作原型
let obj3 = {name : 'anverson', age : 41};
let obj4 = {};
obj4.__proto__ = obj3;
console.log(obj4, obj4.name, obj4.age);

 

 

 

二、对象扩展

博客对应课程的视频位置:

 

 1 <!DOCTYPE html>
 2 <html lang="en">
 3 <head>
 4   <meta charset="UTF-8">
 5   <title>04_对象扩展</title>
 6 </head>
 7 <body>
 8 <!--
 9 1. Object.is(v1, v2)
10   * 判断2个数据是否完全相等,字符串方式比较
11 2. Object.assign(target, source1, source2..)
12   * 将源对象的属性复制到目标对象上
13 3. 直接操作 __proto__ 属性
14   let obj2 = {};
15   obj2.__proto__ = obj1;
16 -->
17 
18 <script type="text/javascript">
19 
20     console.log(Object.is('abc', 'abc'));//true
21     console.log(NaN == NaN);//false
22     console.log(Object.is(NaN, NaN));//true
23 
24     console.log(0 == -0);//true
25     console.log(Object.is(0, -0));//false
26 
27     //Object.assign(target, source1, source2..)
28     let obj = {name : 'kobe', age : 39, c: {d: 2}};
29     let obj1 = {};
30     Object.assign(obj1, obj);
31     console.log(obj1, obj1.name);
32 
33     //直接操作 __proto__ 属性
34     let obj3 = {name : 'anverson', age : 41};
35     let obj4 = {};
36     obj4.__proto__ = obj3;
37     console.log(obj4, obj4.name, obj4.age);
38   
39 </script>
40 </body>
41 
42 </html>

 

 

 
posted @ 2020-03-28 22:28  范仁义  阅读(216)  评论(0编辑  收藏  举报