JavaScript

　The back-end management framework we applied to the project was basically the same, with a level two menu on the left, a click on the selected menu, and a corresponding page on the right. I put the front-end page encapsulation data process,

Things have to be said from an unintentional print in a chrome console.As we all know, JS a total of six data types, string, number, Undefined, Boolean, object, null. Of course, JavaScript also prepares reference types, which are constructed from

1. BOM object: Browser object model (manipulating browser-related content)2. Window ObjectWindow object represents open windows in the browserSetInterval (): It has a return value that is primarily provided to clearinterval usingSetTimeout (): It

Before the project has been using jquery or Vue to do, it is really good, after all, to help us solve a lot of browser compatibility problems, but later found that big company interview questions are to be native JavaScript to do, and then I have a

JavaScript arrays and methods for deep copies of objects (copying arrays or copying objects) prefaceIn JS, the copy of the array and the object is assumed = to be duplicated using the number. That's just a shallow copy.For example, to

Content Profile ...This book, through the analysis of JavaScript, identifies good and bad features, extracting a subset of JavaScript that is more reliable, readable, and maintainable relative to the overall language, so that you can use it to

There are many front-end partners to learn a lot of front-end, but how to become a good programmer, the front-end must learn the knowledge points that the learning front-end partners are very clear in their hearts. The main three elements are HTML,

Execution Environment and scope:All global variables and functions are created as properties and methods of the Window object. When all the code in an execution environment finishes , the environment is destroyed, and all the variables and function

Tag: Boolean access obj error border code execution cell problem codevariables, scopes, and memory issues Values for base types and reference types (1) Basic type: Access by value (Undefined, Null, Boolean, number, String)(2) Reference

JavaScript is single-threadedBecause JS runs in the browser, is single-threaded, each window a JS thread , since it is single-threaded, at a certain time only the specific code can be executed, and block other code. While the browser is event-driven,

In the user login, user register often need to username such as mailbox, mobile phone number to verify, usually use expressions.The following organizes the expression checks on mailboxes and phone numbers:function CheckUser () {var userName =

function Geturlparam (URL, name) { var pattern = new RegExp ("[? &]" + Name + "\= ([^&]+)", "G"); var matcher = pattern.exec (URL); var items = null; if (matcher! = null) { try { items =

Use @ media to implement several key resolutions in web page self-adaptation, and @ media Let's take a look at the following code, which is traversed from bootstrap. min-width is used to confirm that 768, 992, 1200. Of course, in the past, some

Change the color and background-color of selected text, In some special websites, there are often some novel experiences. I believe that many people will share the same habit as me when reading webpages. I will select some texts and read them, or

My enlightenment-Chapter 1 of HTML5 semantic tags-html5 SemanticsHTML5 1. HTML5: the core language of the World Wide Web, the fifth major modification to the HTML specification. Currently, most websites use mainstream compilation languages. Learning

Position attribute of CSS: relative, absolute, positionrelative Relative: It is located relative to itself, for example: # demo {position: relative; top:-50px;}. At this time, # demo will shift 50px to its original position. If the element before

There are several methods to clear the floating, and several methods to clear the floating What if I don't clear the float? (1): the background cannot be displayed. (2): The border cannot be opened (3): The margin value cannot be correctly displayed.

CSS layout --- Center Method, css layout Center In the web page layout, center is a common situation, and center is divided into horizontal center and vertical center.   Text Center In CSS, the center of text is very friendly. We need the text-align

BFC analysis,I. BOX ModelBox is the basic unit of CSS layout. Different types of boxes participate in different Formatting Context (a container that decides how to render the document ), the elements in the box are rendered in different ways.

Implementation of the TreeGrid query function of jQuery EasyUI, jquerytreegrid You need to query treeGrid recently. The specific query interface is as follows: You can query the information of the root node and specific sub-nodes and start to