版权声明：本文为博主原创文章，未经博主允许不得转载。 https://blog.csdn.net/chi1130/article/details/82084177
浅拷贝：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
</head>
<body>
<script>
// 浅拷贝
let obj = {a:{b:10}}
function copy(obj){
let newObj = {};
for(let attr in obj){
newObj[attr] = obj[attr]
}
return newObj
}
let obj2 = copy(obj);
obj2.a.b = 20;
console.log(obj.a.b); // 20 改变
</script>
</body>
</html>深拷贝：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
</head>
<body>
<script>
// 深拷贝
function deepCopy(obj) {
if(typeof obj != 'object'){
return obj;
}
let newObj = {};
for(let attr in obj){
newObj[attr] = deepCopy(obj[attr])
}
return newObj
}
let obj2 = deepCopy(obj);
obj2.a.b = 20;
console.log(obj.a.b); // 10 未改变
</script>
</body>
</html>