JavaSript对象常见操作

1、清空对象数组(常用于提交表单后清除表单数据)

定义数据
var obj={name:"张静",sex:"女",age:26,addres:"成都市"}
【1】、用for in
for(key in obj){
	obj[key]="";
}
【2】、用for循环
for(let i=0;i<Object.keys(obj).length;i++){
	obj[Object.keys(obj)[i]]="";
}

console.log(obj);
结果：obj={addres: "",age: ""​,name: "",sex: ""}

2、清空对象数组2（对象中含有数组对象）

var obj={
	name:"张三",
	age:26,
	address:"成都市",
	pater:[
		{name:"李四",age:26},
		{name:"王亚",age:26}
	]
}
for( key in obj){
	if(obj[key] instanceof Array){
		for(let i=0;i<obj[key].length;i++){
			for(key1 in obj[key][i]){
				obj[key][i][key1]=""
			}
		}
	}else{
		obj[key]="";
	}
}

3、复制对象

var obj = {name:"李四娘",age:30,address:"月牙古镇"};
var copyObj = Object.assign({}, obj);

console.log(copyObj); //{name:"李四娘",age:30,address:"月牙古镇"}

4、合并对象

var objOne ={name:"莫妮卡"}
var objTwo= {age:"30",sex:"女"};
var objThree= {phone:"18400000000"};
var newObj = Object.assign(objOne, objTwo, objThree);

console.log(objOne,"objOne"); 
console.log(newObj,"newObj"); 
Object { name: "莫妮卡", age: "30", sex: "女", phone: "18400000000" }objOne  //***注意目标对象自身也会改变
Object { name: "莫妮卡", age: "30", sex: "女", phone: "18400000000" }newObj