技術標籤：javascript

手寫深拷貝

const obj1 = {
	age : 20,
	name: "xxx",
	address: {
		city: "beijing"
	},
	arr:["a","b","c"],
}

const obj2 = deepClone(obj1)
obj2.address.city = "shanghai"
console.log(obj1.address.city)

function deepClone(obj = {
 
}){
	if(typeof obj !=="object" || obj == null){
		return obj
	}

	//初始化返回結果
	let result
	if(obj instanceof Array){
		result = []
	} else {
		result = {}
	}
	for(let key in obj){
		//保證 key 不是原型的屬性
		if(obj.hasOwnProperty(key){
			//遞迴
			result[key] = deepClone(obj[key])
			
		}
	}
	//返回結果
	return
 
 result
}