JavaScript是一种解释执行的脚本语言,是一种动态类型、弱类型、基于原型的语言,内置支持类型,它遵循ECMAScript标准。它的解释器被称为JavaScript引擎,为浏览器的一部分,广泛用于客户端的脚本语言,主要用来给HTML增加动态功能。 几乎所有主流的语言都可以编译为JavaScript,进而能够在所有平台上的浏览器中执行,这也体现了Java...
addClass('fat') All methods should accept an optional options object, a string which targets a particular method, or nothing (which initiates a plugin with default behavior): $('#myModal').modal() // initialized with defaults $('#myModal').modal({ keyboard: false }) // initialized ...
functionParent(){this.name="父亲";// 实例基本属性 (该属性,强调私有,不共享)this.arr=[1,2];// 引用类型}Parent.prototype.say=function(){// -- 将需要复用、共享的方法定义在父类原型上console.log("hello");};functionChild(like){this.like=like;}// 这里是关键,创建Parent的实例,并将该实例赋...
Loads the resources referenced by this class. This method automatically executes for a View and all of the resources it references in Map if the view is constructed with a map instance. This method must be called by the developer when accessing a resource that will not be loaded in a View...
Class: esri/core/Collection Inheritance: Collection→Accessor Subclasses: SceneModifications Since: ArcGIS Maps SDK for JavaScript 4.0Collection stores an array of items of the same type. It provides useful utility methods for working with items in the Collection, including filter(), find(), and...
4. 内部属性 [[Class]] 是什么? 所有typeof返回值为"object"的对象(如数组)都包含一个内部属性 [[Class]](我们可以把它看作一个内部的分类,而非 传统的面向对象意义上的类)。这个属性无法直接访问,一般通过Object.prototype.toString(..) 来查看。例如:Object.prototype.toString.call( [1,2,3] );// "...
Class Container provides the following member predicates: Container.getParentContainer() returns the parent folder of the file or folder. Container.getAFile() returns a file within the folder. Container.getAFolder() returns a folder nested within the folder. Note that while getAFile and getAFold...
Indirectly, this approach allows child components to interact with the parent's element reference.HTML Copy .red { color: red } HTML Copy function setElementClass(element, className) { var myElement = element; myElement.classList.add(className); } Note For general guidance on J...
values[key] } // 沿着作用域链向上寻找某个变量的值,如果没有找到就返回null private getEnvironmentWithKey(key: string): Environment { if(this.values.hasOwnProperty(key)) { return this } let currentEnvironment = this.parent while(currentEnvironment) { if (currentEnvironment.values.hasOwnProperty(...
设计模式是可重用的用于解决软件设计中一般问题的方案。设计模式如此让人着迷,以至在任何编程语言中都有对其进行的探索。 其中一个原因是它可以让我们站在巨人的肩膀上,获得前人所有的经验,保证我们以优雅的方式组织我们的代码,满足我们解决问题所需要的条件。