在javascript中多次赋值？ [a，b，c] = [1，2，3];意思？ [英] Multiple assignment in javascript? What does [a,b,c] = [1, 2, 3]; mean?

问题描述

对于一个项目，开发者向我们发送了一个类似于以下代码的.js文件：

  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Opera 10.60和Chrome并不适用。 / p>

这只是好奇心，你有没有任何引用或链接说这段代码符合JS / ECMA标准？

您认为什么？

解决方案

解构作业，这是在JavaScript中添加的1.7和ECMAScript 6.它不是ECMAScript 5的一部分：什么是跨浏览器对JavaScript 1.7新功能的支持？具体的数组理解和let声明

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;

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

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

What do you think?

解决方案

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

这篇关于在javascript中多次赋值？ [a，b，c] = [1，2，3];意思？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！