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++) { accHeadi…

vue & lifecycle methods & this bug ES6 Arrow function & this bind bug bad fetchTableData: (url = ``, options = {}) => {} // arrow function & this bind bug! // fetchTableData: (url = ``, options = {}) => { fetchTableData (url = ``, op…

ES6 Arrow Function All In One this const log = console.log; const arrow_func = (args) => log(`args =`, args); // OR const arrow_func = args => log(`args =`, args); const arrow_func = (arg1, arg2) => { log(`args =`, args); // return void 0; } 应用场景…

ES6 arrow function vs ES5 function ES6 arrow function 与 ES5 function 区别 this refs xgqfrms 2012-2020 www.cnblogs.com 发布文章使用:只允许注册用户才可以访问!…

ES6 Arrow Function return Object https://github.com/lydiahallie/javascript-questions/issues/220#issuecomment-523736303 js arrow function return object https://github.com/lydiahallie/javascript-questions/issues/220 https://github.com/lydiahallie/javas…

语法: () => { … } // 零个参数用 () 表示: x => { … } // 一个参数可以省略 (): (x, y) => { … } // 多参数不能省略 (): 当我们使用箭头函数时,函数体内的this对象,就是定义时所在的对象,而不是使用时(执行时)所在的对象.并不是因为箭头函数内部有绑定this的机制,实际原因是箭头函数根本没有自己的this,它的this是继承外面的,因此内部的this就是外层代码块的this. 箭头函数有几个使用注意点. (1)函数体内的this…

ES6 arrow function is somehow like CoffeeScirpt. CoffeeScript: //function call coffee = -> coffee() coffee=(message) -> coffee("Yo"), coffee "Yo" coffee=(message, other) -> coffee("Yo", 2), coffee "Yo", 2 N…

[原创] 码路工人 大家好,这里是码路工人有力量,我是码路工人,你们是力量. 如果没用过CSharp的lambda 表达式,也没有了解过ES6,那第一眼看到这样代码什么感觉? /* eg.0 * function definition */ var arr = [1,2,3,5,8,13,21] arr.forEach(n => console.log(n)) 数组的forEach 方法里需要传入一个函数(没用过 CSharp 里委托 delegate 的也许会觉得奇怪,js 里参数竟然可以是一…

vue watch & arrow function bug watch: { GeoJSON: function(newValue, oldValue) { log(`\n\n\nGeoJSON`, newValue ? JSON.parse(newValue) : newValue); if(newValue) { const { features, } = JSON.parse(newValue); this.showSVGAreas(features || []); // this.$m…

Arrow Function.md Arrow Functions The basic syntax of an arrow function is as follows var fn = data => data; The code means : var fn = function( data ) { return data; } let getNumber = () => 42; console.log(typeof getNumber); console.log(getNumber()…