除去函数声明和函数表达式之外,在JS中还有一种更为简洁的办法可以创造函数,那就是箭头函数,这种方法相对来说更加方便。语法使用时就像一个箭头一样,顾名思义,叫做箭头函数。 let func = (arg1, arg2, ..., argN) => expression; 实际上,上边的用法与下面的函数表达式用法完全相同。 let func = funct
ES6标准新增了一种新的函数:Arrow Function(箭头函数)。 为什么叫Arrow Function?因为它的定义用的就是一个箭头: x=> x * x 上面的箭头函数相当于: function(x) {returnx * x; } 在继续学习箭头函数之前,请测试你的浏览器是否支持ES6的Arrow Function: 'use strict'; alert('你的浏览器支持ES6的Arrow Fu...
functionmyFunction(){constmyArrowFunction=(...args)=>{console.log(args);}myArrowFunction("hehe"...
在有多层函数嵌套的情况下,箭头函数的简洁性并没有很大的提升,反而影响了函数的作用范围的识别度,这种情况不建议使用箭头函数。 来自:https://jingsam.github.io/2016/12/08/things-you-should-know-about-arrow-functions.html
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params) t.isArrowFunctionExpression(path.node) && console.log(path.node.params) } }) types 的主要用途还是构造节点,或者说写一个 Builders(构建器),例如我要生成 let a = 100 这样的变量声明原始代码,通过 types 能轻松帮我们生成。 不过先别急着敲代码,把let a = 100代码进行 ast 解析,看看每个代码...
export default (state = defaultState, action) => { const newState = JSON.parse(JSON.stringify(state)) if(action.type === CHANGE_INPUT_VALUE){//更改input值 newState.inputValue = action.value return newState } if(action.type === ADD_TODO_ITEM){//list新增item newState.list.push(new...
forEach(function(x){ _this.directorsHash[x._id] = x; }) } } With the new ES6 syntax, the function(x){ can be rewritten as (x) => {. This “arrow” method definition not only correctly binds this to the outer scope, but is also considerably shorter, which definitely counts ...
However it also takes advantage of features added to JavaScript in ES2015, the latest standard version of JavaScript, including Iterators, Arrow Functions, Classes, and Modules. It's inspired by the native Map and Set collections added to ES2015. All examples in the Documentation are presented ...
JavaScript arrow function - MDN Arrow function and lexical this 函数参数默认值 从ES2015 JavaScript 更新之后开始,你可以通过下列的语法为函数的参数设定默认值: function myFunc(x = 10) { return x; } console.log(myFunc()) // 10 -- 没有提供任何值,所以在 myFunc 中 10 做为默认值分配给 x conso...