Several methods to achieve deep JS copy

　First, a deep copy of the object several methods

1. Using deep copy implemented recursively

1 function deepClone(obj){
 2 　　let objClone =  Array.isArray(obj) ? [] : {};
 3 　　if (obj && typeof obj === 'object') {
 4 　　　　for(let key in obj){
 5 　　　　　　if (obj[key] && typeof obj[key] === 'object'){
 6 　　　　　　　　objClone[key] = deepClone(obj[key]);
 7 　　　　　　}else{
 8 　　　　　　　　objClone[key] = obj[key]
 9 　　　　　　}
10 　　　　}
11 　　}
12 　　return objClone;
13 }

2. To achieve deep copy the object by JSON 

function deepClone2(obj) {
  let _obj = JSON.stringify(obj),
  return JSON.parse(_obj);
}

　Note: The object methods can not achieve deep copy

 

 

3. By Object.assign () Copy

Note: When the object to be in a deep copy attribute;

When multiple stages of object attributes, the two properties is shallow copy

 

 Second, a deep copy of the array several methods