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Javascript tutorial

The prompt effect of a simple email login is similar to that of a yahoo email address

When the mouse focuses on the email address text box, the text "Please enter email address" in the text box is cleared. Reproduction diagram: Copy the code code as follows: <%@ Page Language="C#" AutoEventWireup="true" Cod

2025-02-28
JS code to determine whether a character exists in a string

Copy the code code as follows: $(function(){ var str="sunny,woo"; var sear=new RegExp(','); if(sear.test(str)) { alert('Yes'); } var tag=',';

2025-02-27
Deeply understand the role of return in javascript

The return here contains some detailed knowledge: for example: the difference between onClick='return add_onclick()' and onClick='add_onclick()'. JAVASCRIPT uses return when calling a function in an event. The return value is actually a re

2025-02-27
A brief analysis of the caching problem of XMLHttpRequest

Have you ever encountered this when using XMLHttpRequest? The first time you use it, it works fine, but after refreshing it, it doesn’t work. After clearing the cache and refreshing it, it works fine again. This is a problem often encountered when using X

2025-02-27
JavaScript type conversion usage method

(1) Converted to a string copy code code as follows: x + 'tostring () string () function converted to string generally output the function body, but it can rewrite its Tostring method (2) to digital copy code code code code As follows: PARSEINT (), Pa

2025-02-27
Tips for setting the drop-down box as read-only with js

During project development, we often encounter the drop-down box to be readonly, but unfortunately, select does not have readonly attributes, so we need to include a span outside the select and change it through js. The following html code adds the span t

2025-02-27
Simple JavaScript mutual lock sharing

Last year, several projects needed to use JavaScript to lock each other, so I wrote a few similar ones. This is one of them: Copy code code as follows: // published by indream Luo // [email protected]//version: chin: chin: chin: chin: chin: chin: chin: c

2025-02-27
JS gets the implementation code of Text and Value selected by the drop -down list

As shown below: Copy code code is as follows:

2025-02-27
Example code similar to Tmall product details moving with the browser

Using this function, it must be integrated into the jquery package principle: when the browser moves to a specified location, the layer floats up, and then adds a style to position the div layer at the top of the browser to copy the code as follows: //Con

2025-02-27
js click elsewhere on the page to close the pop-up layer (sample code)

Copy the code code as follows:<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><title> Untitled document</title>

2025-02-27
JS implementation code for deleting the last character of the string

String: string s = "1,2,3,4,5," Target: delete the last one"," Method: The most used substring is substring, which is also the s=s.substring(0,s .length-1) Recently, I have encountered this kind of thing, such as a string "[lighti

2025-02-27
Use JS to correctly judge whether the user name cookies exist

Sometimes we need to use cookie to save the username to record the login status. How can we correctly determine whether the user cookies exist in the machine? Can't simply write such a way to use A! = ". Copy code code as follows: a = getCookie (

2025-02-27
JS solve the pop -up window problem to realize the class jump DIV example

1. JS code is as follows: Copy code code as follows: <%-Implementing class jumping DIV-%><div id="displayClassDiv" style="display:none;"><ul> <% for (int i = 0; i

2025-02-27
Methods to find all nodes with test classes in the page

Preface Alibaba, the web front-end interns are going to take the online exam. Indeed, I would like to add some knowledge to the rookie. So Baidu and Google had the previous front-end written test questions for Alibaba's campus recruitment, and felt th

2025-02-27
JS menu click to display or hide the effect of simple examples

Copy code code as follows:

2025-02-27

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