innerf.call(this, arg1, arg2, arg3, ...); //或是innerf.apply(this, [arg1, arg2, arg3, ...]) //後面的處理 } 參考資料 Javascript的this用法:http://www.ruanyifeng.com/blog/2010/04/using_this_keyword_in_javascript.html
在js中,所有的函数体(function body)都能访问this关键字.this keyword就是函数执行的context.默认情况下,this引用着调用该函数的那个对象(也就是thisObj.thisFunction中的thisObj)(this is a reference to the object on which a particular function is called),在js中,所有的函数都会被绑定到一个object.然而,...
Examples: JavaScript Build-In Methods JavaScript concat() Method We use theconcat()method to concatenate (join) two strings. For example, letfirstName ="Tony ";letlastName ="Stark"; // built-in string method concat()// join lastName to the end of firstNameletfullName = firstName.concat...
Example constperson= { firstName:"John", lastName :"Doe", id :5566, 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...
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 first thing you need to ask yourself whenever you're trying to figure out what the this-keyword is, is this question.Where is this function invoked? We won't know what the this-keyword is in a function until that function is invoked. ...
与其他语言相比,函数的 this 关键字在 JavaScript 中的表现略有不同,此外,在严格模式和非严格模式之间也会有一些差别。
HERE IS THE JS-FIDDLE.NET LINK FOR EXAMPLE # 2: http://jsfiddle.net/84Yd4/1/ In Example # 3, things get a bit silly, but the effect is the same. Even inside of nested functions, because none of these functions are methods, the JavaScript “this” keyword refers to the window obj...
Explain how this works in JavaScript The “this” keyword in JavaScript is a commonly used method to refer to the code’s current context. If “this” has not been set to anything then it defaults to the global object, which is usually Window. ...
(转)JavaScript中的this关键字 “this”关键字是JavaScript中广泛应用的一种特性,但它经常也是这门语言中最容易混淆和误解的特性。“this”的实际意义是什么?它是如何求值的? 本文试图以清晰的方式澄清和解释这问题的答案。 有过其他编程经验的人对“this”关键字并不陌生,大部分时候当通过构造函数实例化一个类的...