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In browsers, this is usually the window object. console.log(this === window); // true Function Context Inside a regular function, this depends on how the function is invoked: In strict mode, this is undefined. In non-strict mode, this refers to the global object. Continue Reading......
What does "object destructuring" mean and what is the result of a destructuring operation?Say you have an object with some properties:const person = { firstName: 'Tom', lastName: 'Cruise', actor: true, age: 57 }You can extract just some of the object properties and put them into ...
//假设我们定义一个人的类functionPerson(name){}// 方法-介绍你自己(使用this编写)Person.prototype.introduceYourselfWithThis=function(){if(Object.hasOwnProperty.call(this,'name')){return`My name is${this.name}`;}return`I have no name`;}// 方法-介绍你自己(不使用this编写)Person.prototype.intro...
全局作用域中的this是指向window对象的,但window对象上却并没有this这个属性: 函数作用域使用this 函数作用域中的this也是有指向的(本例中指向window对象),我们知道函数的原型链是会指向Object的,所以函数本身可以被当做一个对象来看待,但遗憾的是函数的原型链上也没有this这个属性: ...
JavaScript is based on the concept of objects. Objects are containers that may enclose properties, methods, or both. Consider a simple example. You have an object named “country.” Its properties include its name, continent, capital city, and population. You can create this object in several...
'bootstrap' is not a valid script name. The name must end in '.js'. 'Cannot implicitly convert 'System.TimeSpan' to 'System.DateTime' 'DayOfWeek' is not supported in LINQ to Entities.. 'get' is not recognized as an internal or external command,operable program or batch file 'OleDbConne...
Browser Object Model (BOM):The BOM represents the objects provided by the web browser environment that are not directly related to the document content. Examples of BOM objects include thewindowobject, which represents the browser window, and thenavigatorobject, which provides information about the ...
CUIAutomation object (Windows) _AM_ASFWRITERCONFIG_PARAM enumeration (Windows) Graph Element (Child of ToMainTransition) Games Explorer MinAutoFontSize Element Rendering in a Separate Window (deprecated) (Windows) VHD Enumerations (Windows) MSVidAudioRenderer (Windows) MSVidGenericSink (Windows) out...
As a result, when the web first rose to prominence, every vendor in that space provided some mechanism to make HTML web pages more interactive. Alternatives to JavaScript Microsoft promoted a competitor to JavaScript named VBScript, along with plug-in technologies, such as ActiveX Data Object (...