一、浅拷贝
1、Object.assign(target,source,source...)
a、可支持多个对象复制
b、如果source和target属性相同 source会复制target的属性
c、target只能为Object对象
var obj = {a:1,b:2}
undefined
Object.assign({c:3},obj)
{c: 3, a: 1, b: 2}
obj
{a: 1, b: 2}
兼容性写法if(Object.assign){//兼容}else{//不兼容}2、扩展运算符（spread）
支持将多个对象复制到一个对象上“
var obj1 = { foo: "foo" };
var obj2 = { bar: "bar" };
var copySpread = { ...obj1, ...obj2 }; // Object {foo: "foo", bar: "bar"}
copySpread
{foo: "foo", bar: "bar"}
var obj = {a:1,b:2,c:3}
var objs = {...obj}
objs
{a: 1, b: 2, c: 3}
objs.a=10
10
objs
{a: 10, b: 2, c: 3}
obj
{a: 1, b: 2, c: 3}二、深拷贝
1、使用对象序列化 JSON.stringify()和JSON.parse()
注意：此方法仅在原对象包含可序列化值类型且没有任何循环引用时才有效。不可序列化值类型的一个例子是Date对象 -JSON.parse只能将其解析为字符串而无法解析回其原始的Date对象 或者对象中属性值为function
var obj = {a:1,b:[1,2,3],c:{e:3},bool:false}
undefined
var objs = JSON.parse(JSON.stringify(obj))
undefined
objs
{a: 1, b: Array(3), c: {…}, bool: false}
objs.bool = true
true
objs
{a: 1, b: Array(3), c: {…}, bool: true}
obj
{a: 1, b: Array(3), c: {…}, bool: false}2、使用递归，对对象属性进行判断
function deepClone(obj) {
var copy;
// 如果 obj 是 null、undefined 或 不是对象，直接返回 obj
// Handle the 3 simple types, and null or undefined
if (null == obj || "object" != typeof obj) return obj;
// Handle Date
if (obj instanceof Date) {
copy = new Date();
copy.setTime(obj.getTime());
return copy;
}
// Handle Array
if (obj instanceof Array) {
copy = [];
for (var i = 0, len = obj.length; i < len; i++) {
copy[i] = clone(obj[i]);
}
return copy;
}
// Handle Function
if (obj instanceof Function) {
copy = function() {
return obj.apply(this, arguments);
}
return copy;
}
// Handle Object
if (obj instanceof Object) {
copy = {};
for (var attr in obj) {
if (obj.hasOwnProperty(attr)) copy[attr] = clone(obj[attr]);
}
return copy;
}
throw new Error("Unable to copy obj as type isn't supported " + obj.constructor.name);
}以上就是JS对象复制(深拷贝和浅拷贝)的详细内容，更多关于JS的资料请关注编程网其它相关文章！
