一、拷贝创建对象的原理
1 //拷贝创建对象核心代码
2 function extend(target,source) {
3 //遍历对象
4 for(var i in source){
5 target[i] = source[i];
6 }
7 return target;
8 }
9
10 //游戏随机生成名字
11 var boy = {
12 name:'无忌'
13 ,image:'男性头像'
14 ,age:20
15 ,sex:'男'
16 };
17
18 var gril = {
19 name:'风晴雪'
20 ,age:18
21 ,image:'女性头像'
22 ,sex:'女'
23 };
24
25
26 var zuixiake = extend({}, boy);
27 zuixiake.name='醉侠客';
28 console.log(zuixiake.name);//醉侠客
29 console.log(zuixiake.sex);//男
二、拷贝进阶用法
1 <script>
2
3 //extend2实现的功能：extend(target,obj1,obj2,obj3)
4
5 function extend () {
6 var key,i = 0,len = arguments.length,target = null,copy;
7 if(len === 0){
8 return;
9 }else if(len === 1){
10 target = this;
11 }else{
12 i++;
13 target = arguments[0];
14 }
15 for(; i < len; i++){
16 for(key in arguments[i]){
17 copy = arguments[i][key];
18 target[key] = copy;
19 }
20 }
21 return target;
22 }
23
24 function extend2(){
25 for (var p in source) {
26 if (source.hasOwnProperty(p)) {
27 target[p] = source[p];
28 }
29 }
30
31 return target;
32 }
33
34 //游戏随机生成名字
35 var boy = {
36 name:'无忌'
37 ,image:'男性头像'
38 ,age:20
39 ,sex:'男'
40 };
41
42 //技能名称，等级，伤害值，需要的魔法
43 var technology = {tname:'亡灵复活',tlevel:10,tstrength:3000,tmagic:30};
44
45 var shenqi = {sname:'霜之哀伤',slevel:30,sstrength:3000};
46 //当这个人有了穿上盔甲，圣衣，六神合体，戴上魔法戒指之后，自动也拥有一个技能
47
48 //第一种用法
49 var zuixiake = extend({}, technology,shenqi);
50 zuixiake.name='醉侠客';
51 console.log(zuixiake.name);//醉侠客
52 console.log(zuixiake.tname);//亡灵复活
53 console.log(zuixiake.sname);//霜之哀伤
54
55
56 //第二种用法
57 extend(boy,technology,shenqi);
58 console.log(boy.name);//无忌
59 console.log(boy.tname);//亡灵复活
60 console.log(boy.sname);//霜之哀伤
61
62 </script>
