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Javascript tutorial

Detailed explanation of mutual calls of js functions in frame

Mutual references between frames All frames in a page are provided as attributes of the window object in the form of a collection. For example: window.frames represents a collection of all frames in the page, which is similar to form objects, link objects

2025-03-03
JS judgment 60 seconds and countdown sample code

Use JS to judge 60 seconds to timing, first define a variable refreshTime. When triggering the event, check whether the time to success in the last request is more than 60 seconds. After the request is successful, assign the current time to RefreshTime,

2025-03-03
Introduction to the role of double exclamation mark (!!) in JavaScript

I often see such examples: The copy code code is as follows: var a; var b=!!a; a default is undefined. !a is true, !!a is false, so the value of b is false, no longer undefined, nor other values, which mainly provides convenience for subsequent judgment.

2025-03-03
Summary of 4 methods to make div floating layer, scroll bar move and position remain unchanged

The div remains at the top and the scroll bar scrolls, but the div is still at the top! Upload the source code directly: Method 1: Copy the code as follows:

2025-03-03
Introduction to the parameter use in the DATE date function in JS

To create a date object, you can use the following ways: Copy code code as follows: Var now = new date () Of course, no parameters are passed in the function, indicating that this object has automatically obtained the current time. If you want to create a

2025-03-03
Detailed analysis of javascript operation referer

Referrer Importance There is a referer header in the HTTP request, which is used to indicate the source of the current traffic reference page. For example, click a link on www.sina.com.cn/sports/ to reach the homepage of CCTV.com, then referrer is www.sin

2025-03-03
JavaScript implements a web page floating advertising code with a closed button

Copy code code as follows:<html><head><meta http-equiv="Content-Type" content="text/html; charset=gb2312"><title> Floating advertising code with a closed button

2025-03-03
How to change the shape and style of the mouse by js

Most browsers today support the pointer style (move the mouse over the style name to observe that the pointer style is changed to that style): auto move no-drop col-resize all-scroll pointer not-allowed row-resize cross

2025-03-03
How to implement private properties in JavaScript (2)

In the previous article, I wrote a tool function $class, and this article will improve it as follows. Implement the following functions 1, inheritance 2. When a subclass inherits a parent class, it does not inherit the private properties of the parent cla

2025-03-03
JS is shielding buttons in the input box, and can only type the sample code of the number

Copy code code as follows: <script language="javascript">function GetInput(){//屏蔽非数字和非退格符var k = event.keyCode; //48-57是大键盘的数字键，96-105是小键盘

2025-03-03
Three implementation methods to determine whether an object is empty in js

When writing js scripts, we often encounter situations where the object is empty or not an object. In this case, we can use if to judge it, and then execute the corresponding processing method. The specific methods to judge them are as follows: 1. if (typ

2025-03-03
Example of script merge to improve javascript performance

Each<script>标签初始下载时都会阻塞页面渲染，所以减少页面包含的<script>标签数量有助于改善这一情况。这不仅仅针对外链脚本，内嵌脚本的数量同样也要限制。浏览器在解析HTML页面的过程中每遇到一个<script>标签，都会因执行脚

2025-03-03
Detailed explanation and comparison of Slice, Substr and Substr functions that intercept strings by JavaScript

In JavaScript, extracting substrings mainly uses one of the three methods: Slice, Substring, and Substr. Copy the code as follows: // slice // Syntax: string.slice(start [, stop])"Good news,

2025-03-03
Method to use js to detect whether the browser supports video tags in html5

Copy the code code as follows:/Check whether HTML5function checkVideo() is supported {if (!!document.createElement('video').canPlayType) {var vidTest = document.

2025-03-03
Implementation ideas and code for printing the current time in javascript

Copy the code code as follows:<html><head><title></title><script> /* //声明时间 var date = new Date(); alert(date);//当前时间 alert(date.toLocale

2025-03-03

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