In other words, arrow functions treat this like any other lexical variable. 翻译:换句话说,箭头函数对待this就像对待任何其他词法变量一样 If you use a this inside an arrow function, it behaves exactly as any other variable referenc
function Person( name){ = name; this.x=function(){ return this; } } let p = new Person("mcgrady"); console.log(p===p.x()) //true 1. 2. 3. 4. 5. 6. 7. 8. 9. //严格模式下,函数中的this是undefined "use strict" function f(){ console.log(this); //undefined } f();...
「The this keyword evaluates to the value of the ThisBinding of the current execution context.」「this 这个关键字代表的值为当前执行上下文的ThisBinding。」然后再来看看MDN 对this 的定义：「In most cases, the value of this is determined by how a function is called.」「在大多数的情况下，this ...
Arrow functions were created to simplify function scope and make using the ‘this’ keyword much more straightforward. They utilize the => syntax, which looks like an arrow. Even though I don’t think it needs to go on a diet, people call it “the fat arrow”(and Ruby enthusiasts may k...
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 ...
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) ...
1. Arrow Function 的基本用法 1.1 本质就是匿名函数 普通定义一个函数,要用到function关键字,不管是存在提升现象的function foo() { }还是定义给变量var foo = function() { },这样的话调用时才能找到这个函数,就像每个人都有名字一样。
JavaScript In the example above, when we passobj.greetingas a callback to the functionsayHello(), itsthiskeyword loses itsthisbinding toobjand points to the global object.this.greetis not referring toobj—instead it is referring to the global object. This can be solved by using thebind()me...
一.this的概述this是Javascript语言的一个关键字，它代表函数运行时,自动生成的一个内部对象，只能在函数...