JavaScript

Short-circuit expression: as "&&" and "| |" Operator's operand expression, which is evaluated as long as the final result can be determined to be true or FALSE, the evaluation process terminates, which is called a short-circuit evaluation. This is

First, JavaScript Regular expression overviewRegular Expressions Overview-Regular Expressions (Regular expression): Expressions that are composed of ordinary characters and special characters that describe a particular character rule-Regular

Summarize: • Pass-by-value (call by value) is the most common evaluation strategy: a function's formal parameter is a copy of the argument that was passed when it was called. Modifying the value of a parameter does not affect the argument.

Coercion type conversion functiontoString (): Converts Boolean, numeric, and so on to stringparseint (): Converts a String, Boolean value, to an integerparsefloat (): Converts a String, Boolean, and so on to a floating-point numberThere is no block

Use up and down are differentEnter only numbers, letters, underscoresCommon regular expressions can only enter numbers: "^[0-9]*$"Only n digits can be entered: "^\d{n}$"You can only enter at least n digits: "^\d{n,}$"Only m-n digits can be entered: "

Css circle, triangle, elliptical, arrow icon, css arrow Since the release of css3, its functions have become very powerful. Many icons that require images have been used in the past. Now, only a few pieces of css code are required. The following are

What is BFC and what is a good wife? BFC DefinitionThe BFC (Block formatting context) literal translation is "Block-level formatting context ". It is a stand-alone rendering area with only Block-level box parameters. It specifies how the internal

Five reasons for not using Twitter Bootstrap, twitterbootstrap In our previous blog articles, we discussed the benefits of using Twitter Bootstrap in web design and development projects. Twitter Bootstrap also has many disadvantages. Let's take a

Summary of knowledge points in the JavaScript getting started series and javascript knowledge points JavaScript is a literal-literal scripting language. It is a dynamic, weak, prototype-based language with built-in support types. Its Interpreter,

Javascript pure numbers stop the implementation code of the display effect one by one. js digital code Implementation Code of js pure numbers to stop Display Results one by one Function showScore ($ ele, num, secand, pause) {// second: the number of

Simple paging Control Based on jquery and jquery paging Control There are many front-end paging controls. Here we will share my pagination. js Version 1.0, which is based on jquery. Let's take a look at the preview effect: By default, clicking the

Vertical center of div, vertical center of div I have never been vertically centered before. I read an article to know that the original address is unknown .. 1. diva {2 width: 300px; 3 height: 300px; 4 background-color: green; 5 position:

Use javascript insert style and javascript insert Style 1. Insert the style with javascriptSometimes we need to use js to dynamically generate css code in the style label on the page. The method is very straightforward, that is, to directly create

The JavaScript Regular Expression matches the div style tag, and the regular expression matches the div Test string: abcdefg First Attempt: a newline character cannot be matched because it matches any character except the linefeed (/n. Second

HTML 5 video, html video The video element supports three video formats. IE Firefox Opera Chrome Safari With Theora video encoding and Vorbis Audio EncodingOggFile No 3.5 + 10.5 + 5.0 + No

Node. js Basic module http and webpage analysis tool cherrio implement crawler, node. jscherrio I. PrefaceIt is a crawler, but it does not use third-party class libraries related to crawlers. It mainly uses the node. js Basic module http and the

One wave of JavaScript date judgment script sharing and one wave of javascript 1. Compare two dates var x = new Date('2015-05-25'); var y = new Date('2015-05-25'); if (x.getTime() == y.getTime()) { It'll be true; } 2. Whether it is between two

Using JQuery to write a simple asynchronous paging plug-in, jquery Paging I wrote a Jquery asynchronous paging plug-in to share it with you. Please advise if there are any imperfections.Take the user paging as an example. Let's take a look at the

JavaScript uses onerror to set the default image display instead of alt and javascriptonerror. JavaScript code // Processing function errorImg (img) {img. src = "img .jpg"; img. onerror = null ;} Html code For the sake of beauty, when the webpage

Example of using the FOREACH array method in javascript: javascriptforeach The Array. prototype. forEach () method enables each item of the Array to execute a given function. -MDN Suppose there is a scenario where you get such an array [{Symbol: