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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) ...

1. Special symbols Sharp horn < left horn > right horn Space: &Nbsp: the space occupies the width [font] and has a strong influence &Emsp: the width occupied is exactly one Chinese width, and it is basically not affected by the font Version: & copy Trademark: & Trade & reg 2.div and span labels div: it has no specif ...

If there are many if else in the code, it is difficult to read and maintain. A programmer who doesn't reconstruct if else into high-quality code is not a good programmer. To be clear, not all if / else and switch / cases need to be optimized. When we find that there are "pain points" or "smell bad code", it is best to optim ...

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 ...

I regular expression 1. Concept of regular expression Regular expression, also known as regular expression, is often abbreviated as regex, regexp or RE in code. It is a concept of computer science. Regular expressions are often used to retrieve and replace text that conforms to a pattern (rule). There is not only one regular expression, and ...

$.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( ...