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A brief introduction to shallow copy and deep copy in js and how to implement them
A brief introduction to shallow copy and deep copy in js and how to implement them
This article brings you a brief introduction and implementation methods of shallow copy and deep copy in js. It has certain reference value. Friends in need can refer to it. I hope it will be helpful to you.
First statement: What data type can be copied? Undoubtedly, arrays and objects [Array&Object]
Shallow copy:
* --- Method of copying data (shallow copy affects the original data)
* 1. Directly copy to variable //Shallow copy
* 2.Object.assign() //Object shallow copy
* 3.Array.prototype.concat() //Array shallow copy
* 4. Array.prototype.slice() //Array shallow copy
Deep copy:
Method 1:
//无嵌套对象或者数组浅拷贝
function simpleDeepClone(target){
return JSON.parse(JSON.stringify(target));
}Method 2:
//嵌套对象或者数组深拷贝
//定义检测数据类型的函数
function checkType(target) {
return Object.prototype.toString.call(target).slice(8, -1);
}
//实现深度拷贝
function clone(target) {
//判断拷贝的数据类型
let result, targetType = checkType(target);
if (targetType === 'Object') {
result = {};
} else if (targetType === 'Array') {
result = [];
} else {
return target;
}
//遍历目标数据
for (let i in target) {
//获取数据对象的每一个值
let value = target[i];
//判断目标结构里面是否存在对象/数组
if (checkType(value) === 'Object' || checkType(value) === 'Array') {
//继续遍历
result[i] = clone(value);
} else { //获取到的value值是基本的数据类型或者函数
result[i] = value;
}
}
return result;
}Related recommendations:
jQuery’s $.extend shallow copy and deep copy example analysis
js implementation of deep and shallow copy methods
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