javascript 中的多重赋值?[a,b,c] = [1, 2, 3] 是什么意思?意思是? [英] Multiple assignment in javascript? What does [a,b,c] = [1, 2, 3]; mean?

问题描述

对于一个项目，开发人员向我们发送了一个 .js 文件，其中包含与此类似的代码:

For a project a developer sent us a .js file with code similar to this:

var myList = [1,2,3];
var a,b,c;

[a,b,c] = myList;

它适用于 Opera 10.30、Firefox 3.6.x，但不适用于 Opera 10.60 和 Chrome.

It works in Opera 10.30, Firefox 3.6.x but it's not ok for Opera 10.60 and Chrome.

这只是好奇，您是否有任何参考或链接表明此代码是否符合 JS/ECMA 标准?

It's just curiosity, do you have any reference or link that says this code is compliant to JS/ECMA standard or not?

你怎么看?

推荐答案

这是一个名为 解构赋值，它是在 JavaScript 1.7 和 ECMAScript 6 中添加的.它不是 ECMAScript 5 的一部分:什么是对 JavaScript 1.7 新功能的跨浏览器支持?特别是数组推导式和让"声明

This is a feature called destructuring assignment, which was added in JavaScript 1.7 and ECMAScript 6. It is not a part of ECMAScript 5: What is cross browser support for JavaScript 1.7's new features? Specifically array comprehensions and the "let" statement

这篇关于javascript 中的多重赋值?[a,b,c] = [1, 2, 3] 是什么意思?意思是?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！