javascript - 使用 const 创建动态变量

Question

如何创建以下变量:

const city = 'Your city';
const state = 'your state';
const country = 'Country';

来自输入变量

const address = "Your city, your state, your country";

有没有在 JavaScript 中执行此操作的方法？

Answer 1

有很多方法可以解决这个问题。如果字符串始终采用 value1 <comma> value2 <comma> value3 的格式你可以很容易地使用 String.prototype.split() 从字符串中获取一个数组，然后将常量分配给数组索引:

let address = "Your city, your state, your country";

address = address.split(", ");

const city = address[0];
const state = address[1];
const country = address[2];

console.log(city, state, country);

在 ES6 中，你可以使用解构赋值来缩短这段时间:

let address = "Your city, your state, your country";

address = address.split(", ");

const [city, state, country] = address;

console.log(city, state, country);