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1, js array summary 1. Create (from/of) 1.Array() constructor There are several basic ways to create arrays. One is to use the Array constructor, such as: There are several basic ways to create arrays. One is to use Array Constructor, for example: let colors = new Array(); If you know the number of elements in the array, you can pass a va ...

Dependency injection is a major feature of Angular, through which you can write more maintainable code. But the JavaScript language itself does not provide the function of dependency injection, so how does Angular implement the function of dependency injection? Read this article and you will find the answer.A typical Angular application, from t ...

A clock is a device that we use to measure time. If used properly, the clock is a useful element for any UI. The clock can be used for websites with time as the main focus, such as some booking websites or some applications that display the arrival time of trains, buses, flights, etc. There are basically two types of clocks, analog and digita ...

catalogue preface Cross domain Cross domain solutions I Modify local HOST: II JSONP III CORS Quad proxy preface Send request XMLHttpRequest(ajax, $ajax, axois),fetch http://192.168.0.103:8080/ file:///F://vue Stage / Vue Engineering/_ systerm/public/index. The HTML: File protocol does not allow sending ajax requests In normal pro ...

React is our view framework, but it is difficult to manage the data state that needs to be shared during large-scale project development. Components with obvious parent-child relationship are also more convenient to transfer values, but it is very troublesome for unrelated components to transfer values. At this time, we need to use our state ma ...

preface For the home page APP with a large number of pictures, you need to add a large number of pictures when opening the commodity display page. In this scenario, if you directly load the full amount, it will inevitably lead to excessive page performance consumption, white screen or Caton, and the user experience is very bad. Do users really ...

A data type is a literal type There are eight basic data types in JavaScript (the first seven are basic data types, also known as primitive types, while object is a complex data type). Number is used for any type of number: integer or floating-point number, an integer in the range of ± (253-1).bigint is used for integers of any length. ...

ES6 let keyword <script> // es6 defines variables // js definition: var has no scope, the same variable can be declared multiple times // es6: let scope code is fast, the same variable can only be declared once { var a = 1 let b = 2 } console.log(a) // 1 console.log(b) // Uncaught ReferenceError: ...

Vue inter component communication Several scene previews Data transfer between parent and child componentsData transfer between sibling componentsData transfer between ancestor components and subcomponents - props / $emit - $parent / $children and ref - $emit / $on - vuex - $attrs / $listeners - provide / inject Several component communica ...

1. VUE CLI related 1.1 vuecli- introduction and installation of scaffold Vue cli is an officially released Vue JS project scaffold Vue cli can be used to quickly build Vue development environment and corresponding webpack configuration Vue CLI prerequisites - Node and Webpack Install node JS: you can download and install it on the ...