对象赋值

js-Object

会更改obj的数据

var obj = [{
    name: "aa",
    age: 18
},{
    name: "bb",
    age: 20
}]
for(var i = 0; i < obj.length; i++){
    var obj1 = obj[i];
    obj1["name"] = "ccc"
}
console.log(obj)
/*
0: {name: "ccc", age: 18}
1: {name: "ccc", age: 20}
*/

会更改obj的数据

var obj = [{
    name: "aa",
    age: 18
},{
    name: "bb",
    age: 20
}]
var obj1 = {}
for(var i in obj){
    obj1[i] = obj[i];
}
obj1[1].name = "vvv"
console.log(obj)
/*
0: {name: "aa", age: 18}
1: {name: "vvv", age: 20}
*/
console.log(obj1)
/*
0: {name: "aa", age: 18}
1: {name: "vvv", age: 20}
*/

不会更改obj的数据

var obj = [{
    name: "aa",
    age: 18
},{
    name: "bb",
    age: 20
}]
for(var i = 0; i < obj.length; i++){
    var obj1 = obj[i];
    obj1 = {
        name: "vv"
    }
}
console.log(obj)
/*
0: {name: "aa", age: 18}
1: {name: "bb", age: 20}
*/

作者 wendy
2019 年 7月 22日