you're going to find that whenever you get in these situation of trying to figure out what the this-keyword is, the very first thing you should do is look at when the function was invoked, and look if there's anything to the left of the dot, because if there is, that's what this...
What the this-keyword allows us to do, is it allows us to reuse functions with different contexts, or in other words it allows us to decide which objects should be focal when invoking a function or a methods. Imagine we had one function, and we had a bunch of objects that had similar...
1varname = "Bob";2varnameObj ={3name : "Tom",4showName :function(){5alert(this.name);6},7waitShowName :function(){8setTimeout(this.showName, 1000);9}10};1112nameObj.waitShowName(); 要解决这个问题我们需要了解Javascript的this关键字的用法。 this指向哪里? 一般而言,在Javascript中,this...
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/call bind Thebind()method creates a new function that, when called, has itsthiskeyword set to the provided value, with a given sequence of arguments preceding any provided when the new function is called....
http://www.ruanyifeng.com/blog/2010/04/using_this_keyword_in_javascript.html 分情况讨论。 情况一:纯粹的函数调用 这是函数的最通常用法,属于全局性调用,因此this就代表全局对象Global。 var x = 1; function test(){ this.x = 0; ...
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...
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 ...
fullName :function() { returnthis.firstName+" "+this.lastName; } }; Try it Yourself » What isthis? In JavaScript, thethiskeyword refers to anobject. Thethiskeyword refers todifferent objectsdepending on how it is used: In an object method,thisrefers to theobject. ...
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...
The 'this' keyword can lead to a lot of confusion in JS. So can function calls without parenthesis. What's the idea behind this.someFunction.bind(this)?