对象{a1:1,a2:2,a3:3},for循环，如何根据键 a+'i' 获取值

Question

问题如题目描述

Answer 1

const obj = {a1:1,a2:2,a3:3};
for(let i = 0; i<= 3; i++){
    console.log(obj['a'+i])
}

Answer 2

var obj = {a1:1,a2:2,a3:3};
var i = 2;
console.log(obj['a' + i])

Answer 3

// 一种
let obj = {a1:1,a2:2,a3:3};
for(let i = 1; i<4; i++){
    console.log(obj['a'+i]);
}

// 另一种
let obj = {a1:1,a2:2,a3:3};
let keys=Object.keys(obj);
keys.forEach((item, index)=>{
    console.log(obj[item]);
});