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JavaScript Function Function Active Domain Learning Example (JS Activity Domain)

In some program -like programming languages, each code in the brackets has its own scope, and the variables are not visible outside the declaration of their code segment. We call the block scope (block scope) And JavaScript does not have a block -level sc

2025-02-24
Use Keydown event to prevent users from entering implementation code

First understand the differences between each event KeyDown: KeyPress occurs when the key is pressed when the control has focus: KeyUp occurs when the key is pressed when the control has focus: KeyUp occurs when the key is released when the control has fo

2025-02-24
Detailed explanation of the difference between the size of the web and the window of JavaScript under IE and FF

Under the newly defined standard, the document.documentedlement.clientheight can obtain the correct value in IE and Firefox. The following article introduces the difference between the size of the window size to obtain various browsers:

2025-02-24
Sumid attention when html writing EDM (Generally, you need to pay attention to emails)

Format code 1. Page width, please set within 600 to 800px, within 1024px. 2. HTML encoding, please use UTF-8.3, HTML code within 15kb. (The collection standards for each mailbox are different. If you exceed 15KB, your email is likely to enter the trash)

2025-02-24
Parsing the img image did not find the onerror event Stack overflow at line: 0

When opening the web page, it prompts Stack overflow at line: 0. I made a screenshot as follows: After analysis, I found that there is code similar to the following in the web page:

2025-02-24
js sample code to disable carriage return submission form

As shown below; copy the code as follows: function ifenter(){ if(event.keyCode==13){return false;}else if(event.srcElement.type=="submit"){ form1.su

2025-02-24
Discussion on the use of javascript:void(0)

When making a page, if you want to do nothing after clicking a link, or complete other things in response to clicking, you can set its attribute href = "#", but there will be a problem, that is, when the page has scroll bars , after clicking, it

2025-02-24
Html5 canvas

1. The definition of Canvas<canvas id=myCanvas width=400 height=200> default<canvas> The canvas will display a blank, borderless rectangle on the page. In order to make it display the contour, it adds a dotted bezel to it by defining the rules of the styl

2025-02-24
JS method calls the problem of parentheses to discuss

The html page of the mobile terminal, write a function. Copy code code as follows: Function Showalert (MSG, Fn) {showDialog ("Alert", msg, "Warm reminder", 260); if (isnull (fn) == false) {

2025-02-24
js implementation code to jump page after 3 seconds

How many seconds will it take to automatically jump to other pages (js scripts) Method 1:<head></head> Add the js copy code between them as follows: <script language="javascript">var secs = 3; //倒计时的秒数 var URL ;funct

2025-02-24
JavaScript realizes the number of characters when writing characters in text domain

Copy code code as follows:

2025-02-24
JS control ASP.NET's treeview control selects all or cancels (sample code)

Copy the code code as follows:<script language="javascript"> /* 函数名称:CheckNode(currentNode)、ParentNode(currentNode)、ChildNode(currentNode) 函数

2025-02-23
One article completely solves the problem of long-press saving image function in HTML5 pages

This article introduces in detail how to implement the function of long pressing to save pictures in H5. Long press to save pictures is a very common requirement in some H5 promotional pages, but js does not have such a capability, so you must either rely

2025-02-23
javascript: window.open popup location problem

The location of the window.open pop-up window is problematic. Record the copy code code as follows:<SCRIPT LANGUAGE="javascript"> <!-- window.open ('page.html', 'newwindow', 'height

2025-02-23
Introduction to the PARSEINT function parameter settings

We often use the PARSEINT function to convert the strings as int value. The PARSEINT function has two parameters that can be set, and the second parameter can be default. Parseint ("" String ", in advance) VAR NUM1 = PARSEINT (" 10 &qu

2025-02-23

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