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Javascript tutorial

JS converts numbers into three-digit comma-separated styles (sample code)

Copy the code as follows: function formatNum(num){ if(!/^(/+|-)?(/d+)(/./d+)?$/.test(num)){alert("wrong!") ; return num;} var a = RegExp.$

2025-01-29
Sample code for javascript to obtain the current value of select (compatible with IE/Firefox/Opera/Chrome)

JavaScript gets the current value of Select: var value = document.getElementById("select").options[document.getElementById("select").options.

2025-01-29
js method to determine whether the client is an iOS or Android mobile terminal

Judgment principle: JavaScript is the main language for front-end development. We can judge the type and version of the browser by writing JavaScript programs. There are generally two methods for JavaScript to determine the browser type. One is to disting

2025-01-29
Use JS to control the up, down, left and right keys of the keyboard (sample code)

This is a basic JS code. Friends who want to learn JS can study it or expand it. It is best to use JS to control the entire keyboard, which will be very interesting. The specific code is as follows: Copy the code and the code is as follows: <style>tr.high

2025-01-29
Example code for defining strings in javascript

Copy the code code as follows:<html><head><title> The definition of string in javascript</title><script> //定义字符串 //第一种 var str = new Array(); alert(str);//空字符

2025-01-28
js lottery to achieve random lottery code effect

Randomly selected, simple code. Copy the code code as follows:<html><title> Random lottery procedure</title><head><meta http-equiv=Content-Type content="text/html; charset=gb2312">

2025-01-28
JS sample code to close the web page window directly without prompting

In IE7 and IE8, the current window or tab can be closed using the close() method provided by JavaScript, but an annoying dialog box is prompted. After looking for the code, I can finally close it directly without prompting. JavaScript code copy code is as

2025-01-28
A simple example of js validating integers plus retaining decimal points

Copy the code as follows: function validateNum(obj) {//Positive integer (cache is used here) var number = obj.data(validate).number;//Decimal point (cache is used here) var decimal = obj.d

2025-01-28
JavaScript date formatting example sharing

Copy the code code as follows:/** * Formatted date * @param {Object} ms represents the number of milliseconds in global standard time between the specified date and midnight on January 1, 1970 * @return year-month-date hh:mm */ Util.pa

2025-01-28
Example code for sorting group names after gridpanel grouping in ExtJs

Copy the code as follows:/** * Define groupingStore in descending order */var DescGroupingStore = Ext.extend(Ext.data.GroupingStore, { groupDir : 'ASC', group

2025-01-28
Detailed explanation of the application of parentNode, childNodes, and children in javascript

"parentNode" is often used to get the parent node of an element. Understanding parentNodes as a container, there are child nodes in the container. For example:<div id="parent"> <b id="child">My text</b></div> In the above code, you

2025-01-28
The specific implementation of using js to refresh the current page and retain parameters

After the website has a certain amount of traffic, it needs to find ways to improve the stickiness of the website. World Buyer Network recently plans to develop a set of foreign trade tools, which are some commonly used tools, such as world time query htt

2025-01-28
Example code for JS keyword spherical rotation effect

Sometimes I search for information on the Internet and see the keyword rotation effect on other people's blogs, which I think is quite good. So I searched the Internet for its implementation, and OK, I wrote it myself. HTML: Copy the code. The code is

2025-01-28
Solve the problem that window.open in js pops up the last cached page

Solve the problem that the page opened by window.open will save the cache. Add the following code to the head tag of the page. Copy the code. The code is as follows:<meta http-equiv="Pragma" content="no-cache" />

2025-01-28
Javascript sets the ReadOnly property of an object (sample code)

The ReadOnly attribute in JS is rather strange. Directly creating an object and assigning the readonly attribute to the object cannot be done in the same way as in HTML: Copy the code. The code is as follows: var x=document.createElement("input"

2025-01-28

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