花括号内的变量启动

Question

这段代码转化为什么？我无法弄清楚花括号内的变量是如何与之相关的= require('react-router').

var { create: createRouter, HistoryLocation, HashLocation } = require('react-router')

它来自这个回购

Answer 1

这是ES6中称为解构赋值的功能.这是发生的事情:

// Imagine this is the object you require
var reactRouter = {
  create: 'foo',
  HistoryLocation: 'bar',
  HashLocation: 'baz'
}

// Destructure
var {create: createRouter, HistoryLocation, HashLocation} = reactRouter

// Now the variables are in scope
console.log(createRouter, HistoryLocation, HashLocation)
//^ foo, bar, baz