The very first thing to understand when we're talking about this-keyword is really understand what's the purpose of the this-keyword is, or why we even have this-keyword in JavaScript. What the this-keyword allows us to do, is it allows us to reuse functions with different contexts, or...
结合第一点,函数作为对象的一个方法使用,这里存在一个小坑,即闭包,啥是闭包,这个在这里就不扯开了,最简单的理解就是Function that returns function,如果不理解什么是闭包的话,可以去翻翻 《JavaScript 高级程序设计》第七章关于闭包的相关内容。第一点当中存在一个小坑,就是将对象的方法赋予给一个变量的时候,其...
The very first thing to understand when we're talking about this-keyword is really understand what's the purpose of the this-keyword is, or why we even have this-keyword in JavaScript. What the this-keyword allows us to do, is it allows us to reuse functions with different contexts, or...
'use strict';this.name ='Jack';functiongreet(){// this refers to undefinedconsole.log(this); } greet();// undefined Run Code Note: When usingthisinside a function with strict mode, you can useJavaScript Function call(). For example, 'use strict';this.name ='Jack';functiongreet(){con...
In JavaScript, thethiskeyword refers to anobject. Thethiskeyword refers todifferent objectsdepending on how it is used: In an object method,thisrefers to theobject. Alone,thisrefers to theglobal object. In a function,thisrefers to theglobal object. ...
this keyword The "this" is special keyword in JavaScript. It is used to refer to the object on which a method is being invoked. So what is the the value of "this" in a given context ? We will state some basic steps. Do not worry if you do not understand it. Just read it once...
本文翻译自PPK的The this keyword。 via:http://biaoge.me/2010/01/289 有时出现错误: Object [object DOMWindow] has no method ‘attachEvent’ This error occurs when trying bind an event, usingwindow.attachEventas a function, which only works in Internet Explorer. ...
JavaScript this Keyword We usethiskeyword in an object method to access a property of the same object. For example, // person objectconstperson = {name:"John",age:30,// methodintroduce:function(){ console.log(`My name is${this.name}and I'm${this.age}years old.`); ...
Learn how the JavaScript “this” keyword behaves inside of function declarations and expressions, even when nested 10 levels deep. In the article: The JavaScript “this” Keyword Deep Dive: An Overview, we discussed a number of scenarios in which the JavaScript “this” Keyword has different me...
function getThisStrict() { "use strict"; // 进入严格模式 return this; } // 仅用于演示——你不应该改变内置的原型对象 Number.prototype.getThisStrict = getThisStrict; console.log(typeof (1).getThisStrict()); // "number" 如果函数在没有被任何东西访问的情况下被调用,this 将是undefined——但...