<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title></title>
</head>
<body>
<script>
var n=6;
var m=n;
console.log(m);//6
var obj1={"a":1,"b":2}; //obj1:0x001
//浅拷贝
var obj2=obj1; //obj2:0x001
obj2.a=6;
console.log(obj1); //{a: 6, b: 2}
//对象深拷贝
var obj3={};
for (var key in obj1) {
//obj3.a=1;
obj3[key]=obj1[key];
}
console.log(obj3); //{a: 6, b: 2}
obj3.b=888;
console.log(obj3); //{a: 6, b: 888}
console.log(obj1); //{a: 6, b: 2}
var ary1=[1,2,3];
var ary2=ary1;
ary2[1]=6;
console.log(ary2); //[1, 6, 3]
//数组深拷贝
var ary3=[];
for (var key in ary1) {
ary3[key]=ary1[key];
}
console.log(ary3); //[1, 6, 3]
ary3[1]=666;
console.log(ary3); //[1, 666, 3]
console.log(ary1); //[1, 6, 3]
</script>
</body>
</html>浅拷贝：拷贝基本数据类型时，不受任何影响，
当拷贝引用类型时，源对象也会被修改。
深拷贝：就是完完全全拷贝一份新的对象，
它会在内存的堆区域重新开辟空间，
修改拷贝对象就不会影响到源对象