箭头函数(arrow function) 基本格式 调用一个小括号可以去掉 2个小括号就不能去掉 返回 可以前置 不能前置...es6 的arrow function arrow function的简写方法正在学习中... class Animal { constructor(){ this.type = 'animal' } says(say){ setTimeout(function(){ console.log(this.type + ' says ' ...
ES6 新增了一种新的函数: 箭头函数 Arrow Function 箭头函数相当于匿名函数,简化了函数定义,将原函数的 function 关键字和函数名都删掉,并使用=>连接参数和函数体 1. ES6 前定义函数 // function 关键字 function add(num1, num2) { return num1 + num2; } // 函数表达式 const sub = function (num1,...
ping: function(){ retuen that.msg; // Warning } } // 又等价为 var that = this; var obj = { /* ... */ }; obj.ping = function(){ return that.msg; } 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 同样地,在箭头函数中也没有arguments、 callee 甚至 caller 等对象。
//ES5var tt = function tt() {return 55 + 99;};//ES6var tt = () => 55 +99//是不是一对比,写法的差异就看出来了 用法汇总 //ES5匿名函数的用法var testArr = [1,2,3,4,5,6];var test = testArr.reduce(function (previous, current, index, array){console.log(previous); //累加值c...
ES6 新增了一种新的函数: 箭头函数 Arrow Function 箭头函数相当于匿名函数,简化了函数定义,将原函数的 function 关键字和函数名都删掉,并使用 => 连接参数和函数体 1. ES6 前定义函数 1. // function 关键字 2. function add(num1, num2) { ...
1.Function Invocation function getContext(){ console.log(this); } getContext() is a Window/Global object.At the time getContext() is called,JavaScript automatically sets this at the global object,which in browser is Window. if(this === window){ ...
ES6 Arrow Function & this bug let accHeadings = document.querySelectorAll(`.accordionItemHeading`); // NodeList(3) // let accHeadings = [...document.querySelectorAll(`.accordionItemHeading`)]; for (let i = 0; i < accHeadings.length; i++) { ...
// Normal Functionconstnumbers=function(one,two){}// Arrow Function, with parenthesesconstnumbers=(one,two)=>{} #⚠️ Arrow Functions Gotcha: Returning Objects Remember I mentioned about the different body types - concise body and block body. Just to quickly update you in case you skipped...
ES2015 (ES6) introduces a really nice feature that punches above its weight in terms of simplicity to integrate versus time saving and feature output. This feature is the arrow function. Before we dive into the features of the arrow function and what it actually does for us, let’s ...
This is a new technology, part of the ECMAScript 2015 (ES6) standard.This technology's specification has been finalized, but check the compatibility table for usage and implementation status in various browsers. 箭頭函數表示式 (Arrow function expression,也是所謂的 fat arrow function) 比起一般的函...