var func1 = function(arg1, arg2) {}; 就可以通过 func1.call(this, arg1, arg2); 或者 func1.apply(this, [arg1, arg2]); 来调用。其中 this 是你想指定的上下文,他可以任何一个 JavaScript 对象(JavaScript 中一切皆对象),call 需要把参数按顺序传递进去,而 apply 则是把参数放在数组里。 JavaScrip...
js原型继承与多态 How to apply virtual function in javascript functionBaseClass() {this.hello =function() {this.talk(); }this.talk =function() { document.write("I'm BaseClass"); } };functionMyClass() { BaseClass.call(this);this.talk =function() { document.write("I'm MyClass"); }...
代码语言:javascript 复制 Function.prototype.construct=function(aArgs){varoNew={};oNew.__proto__=this.prototype;this.apply(oNew,aArgs);returnoNew;}; 使用群: 代码语言:javascript 复制 Function.prototype.construct=function(aArgs){varfConstructor=this,fNewConstr=function(){fConstructor.apply(this,a...
The method calls thegreet()function so theresultvariable holds the return value ofgreet(). Apart from calling a function, we can use theapply()method for: Function borrowing Append an array Example 2: apply() for Function Borrowing // object definitionconstcar = {name:"BMW", description() ...
javascript的Function中有不少不那么常用,又或者用了也是知其然而不知其所以然的属性/方法,本文就来谈谈这一系列属性/方法:caller/callee/apply/call/bind。 caller属性 直接上DEMO比较好理解: // caller demo { function callerDemo() { if (callerDemo.caller) { ...
JavaScript Function.apply() 函数详解,apply()函数用于调用当前函数functionObject,并可同时使用指定对象thisObj作为本次函数执行时函数内部的this指针引用。该函数属于Function对象,所有主流浏览器均支持该函数。语法functionObject.apply([thisObj[,argsArray]...
In JavaScript strict mode, if the first argument of theapply()method is not an object, it becomes the owner (object) of the invoked function. In "non-strict" mode, it becomes the global object. Track your progress - it's free!
“JavaScript 的一大特点是,函数存在「定义时上下文」和「运行时上下文」以及「上下文是可以改变的」这样的概念。” 所以, 某函数.call(某对象,参数1,参数2,……) =》某函数内部的this被替换成了某对象 1. 2. for example function fruits() {}
call, apply都属于Function.prototype的一个方法,它是JavaScript引擎内在实现的,因为属于Function.prototype,...
This is the second part of my three-parter on JavaScript function methods. Last time I talked about call(). This time I’ll talk about apply(). apply(), like...