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preface This article records my notes on learning JS forms and Jquery Ajax 1. JS form Form is a very common way for our page to transmit data to the background. Before sending data (request), we should verify the legitimacy of a series of data on the page, save unnecessary wrong data transmission, and improve the user's experience. 1.1. Ge ...

array Definition of array   <script type="text/javascript" > /*Definition of array*/ //Implicit definition var arr1 = []; console.log(arr1); var arr2 = [1,2,'a',true]; console.log(arr2); //Direct instantiation var arr3 = new Array(1,2,3); console.log(arr3); //Define the array and set the length var arr4 = new Array(5); console.log(); ...

1, Breakpoint continuation Breakpoint continuation overview Breakpoint continuation means that when downloading or uploading, the download or upload task is divided into several parts, and each part is uploaded or downloaded by one thread. In case of network failure, you can continue to upload and download the unfinished part from the ...

ECMA-262 defines an object as an unordered set of attributes. We can think of objects in JS as a hash list, where the content is a set of key-value pairs, and the type of value can be data or function. 1. Understanding Objects The usual way to create a custom object is to create a new instance of a new Object, then add properties and methods ...

CSS style sheet 1, Overview 1. What is CSS? Cascading style sheets, customizing the display style of html elements and beautifying the page are very important for the construction of front-end pages 2. Why use CSS (1) CSS refers to cascading style sheets (2) Styles define how HTML elements are displayed (3) Styles are usually stored in sty ...

VueUse component data lazy loading 1. Understanding Objective of this section: to understand what component data lazy loading means from a practical point of view Think about two questions Where are our general data requests initiated?What are the characteristics of life cycle hook function? At present, ajax requests in each componen ...

Semantic What is semantics Each HTML element has a specific meaning a element: hyperlink p element: paragraph h1 element: first level title All elements have nothing to do with the display effect The effect of elements displayed in the page should be determined by CSS. Because browsers have default CSS styles, each element has some de ...

1. Built in objects 1.String 2 .Math 3.Date Month: from 0 to 11, so remember to add 1 2. Object Object is an unordered data set composed of several "key value pairs". This "key value pair" format is called JSON format 1. Create objects in literal form var Object name = {}; // Empty object var Object name = { ...

introduction Suddenly I didn't know what was written in this chapter. I felt the content was a little dry. I took care of the translation and didn't absorb it To sum up, it is mainly about how to combine the responsive object with the template. The responsive object is realized through the proxy object of JavaScript; The objects of response ar ...

@[TOC] table of contents according to Rookie tutorial Add a few personal understanding and finishing, which can be used to review the knowledge points. For details, please refer to the original link 1. re.match function re match(pattern,string,flags=0) re.match only matches the beginning of the string. If the beginning of the string does not ...