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catalogue 1,indexof() 2,charAt() 3,concat() 4,substring()  5,substr() 6,slice()  7,replace()  8,replaceAll()  9,split() 10,trim() 11,match() 1,indexof() indexOf() Method returns the String The index of the specified value that first appears in the object, from fromIndex Search at Cable. Returns if the value is not ...

Build a JavaScript Single Page App Without a Framework - SitePoint The front frame is great. As your projects evolve, they can be structured in a way that allows you to understand most of the complexity of your application and help you organize it in a single page. However, there is also a downside: these frameworks incur a certain degree of ...

Through slot You can import custom upload button types and text prompts. You can limit the number of uploaded files and define the behavior when the limit is exceeded by setting limit and on-exceed ed. You can prevent file removal by setting before remove. <el-upload class="upload-demo" action="https://jsonplaceholder.typicode.com/pos ...

New label Represents a block Represents an article. Such as articles, comments, posts and blogs Represents a header Represents a footer Indicates navigation Represents the sidebar. Such as the sidebar of the article Indicates media content grouping (less used) ...

BOM and DOM operations What are BOM and DOM BOM refers to the object model of the browsing area, which enables js to operate the browser through it DOM refers to the document object model, which enables js to operate the front-end page (that is, all elements of HTML document) BOM needs to master operation window.open() - Open a n ...

Vue front end development framework Vue cli project scaffold is based on Vue JS for rapid development of a complete system Document address https://cli.vuejs.org/zh/ Install node js https://nodejs.org/zh-cn/Install Vue cli scaffold npm install -g @vue/cli Create a vue project Execute command vue create hello-world(Project name) Quickly ...

$.grep() $.grep( array, function(elementOfArray, indexInArray) [, invert ] ) Function: find the array elements that meet the filter function: <script src="js/jquery1.42.min.js"></script> <script type="text/javascript"> $(function () { var arr = [23,45,5,1,4,67,8,100,-2]; var arrGrep = $.grep( ...

1. Introduction to express Express is based on node JS platform, a fast, open and minimalist Web development framework (a third-party package on npm). Its function is similar to that of node JS is similar to the built-in http module, which is specially used to create a Web server. The built-in http module is very complex but inefficient; ...

Review jq today jQuery concept: jQuery is a fast and concise JavaScript library, which is an encapsulated specific collection (Methods and functions) Learning the essence of jQuery: learning to call these functions (Methods). Simple understanding: it is a js file that encapsulates our native js code and stores it in it. In this way, we can ...

vue-lit be based on lit-html + @vue/reactivity The template engine is implemented in only 70 lines of code Vue Composition API , used to develop web component s.summary<my-component></my-component> <script type="module"> import { defineComponent, reactive, html, onMounted, onUpdated, onUnmounted } ...