JavaScript - this Keyword - In JavaScript, the 'this' keyword contains the reference to the object. It represents the context of the function or current code. It is used to access the properties and methods of the current object.
it has a leading parent x, that's why it returned x - in case of x.y()() & x.y()()(), there the insider function is called which don't have a leading parent object and hence that will return window.
箭头函数(Arrow Function)是ECMAScript 6中的新特性。 问题 从代码中分析箭头函数的指向问题: function foo() { return ()=>{ console.log(this.a) } } const obj1 = {a:1} const obj2 = {a:2} const bar = foo.call(obj1) bar.call(obj2) 我们将会看到哪一个 obj 的a会被打印出呢? 假如fo...
In regular functions, the this keyword represents the object called the function, which could be the window, the document, a button, or whatever. In arrow functions, the this keyword always represents the object that defined the arrow function. To get the object called the arrow function, you...
Before we dive deeper into ES6 arrow functions, it’s important to first have a clear picture of what ‘this’ binds to in ES5 code. If the ‘this’ keyword were inside an object’smethod (a function that belongs to an object), what would it refer to?
In JavaScript,thiskeyword refers to theobjectwhere it is called. 1. this Inside Global Scope Whenthisis used alone,thisrefers to the global object (windowobject in browsers). For example, leta =this;console.log(a);// Window {}this.name ='Sarah';console.log(window.name);// Sarah ...
查了下此时arrow function中的this是global context,虽然知道这规则就是es6这样规定的,但是好奇心仍然得不到满足,今日偶然在知乎看见一个回答提到了更多信息。 原题是探讨关于this的缺陷的,其中 贺师俊 的回答提到: 1. JavaScript的this在直接调用时会是global,这是不是个错误?
A function's this keyword behaves a little differently in JavaScript compared to other languages. It also has some differences between strict mode and non-strict mode. JavaScript是一门比较奇特的语言,它的this与其他语言不一样,并且它的取值还取决于代码是否为严格模式("use strict")。
arrow function 箭头函数中的this 箭头函数 箭头函数是对正规函数的语法简化,它没有this、arguments等属性,也不能当作构造函数使用,在使用中尤其要注意箭头函数没有自己的this,它的this是绑定的父作用域上下文,箭头函数主要用在匿名函数的地方,写起来更简单,比如...
A function's this keyword behaves a little differently in JavaScript compared to other languages. It also has some differences between strict mode and non-strict mode. JavaScript是一门比较奇特的语言,它的this与其他语言不一样,并且它的取值还取决于代码是否为严格模式("use strict")。