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Javascript tutorial

Determine the data type of javascript (sample code)

1 The code to determine whether it is an array type is copied as follows:<script type="text/javascript"> //<![CDATA[ var a=[0]; document.write(isArray(a),'<br/>'); f

2025-02-23
Method for generating random upper and lower case letters in javascript

Copy the code as follows: /** * Return a random lowercase letter*/ function getLowerCharacter(){ return getCharacter("lower");; } /** * Return a random uppercase letter*/ funct

2025-02-22
Introduction to uploading php file (example explanation)

1. File Upload In order to enable the client user to upload files, we must provide a form in the user interface to submit the request to upload files. Since the uploaded file is a special data, unlike other post data, we must set a special encoding for th

2025-02-22
JavaScript 3D Detective Product Display (Core Lite)

3D javascript image material javascript part of the code copy code as follows:<span style="white-space:pre"> </span>var step = 0; var first = 0; var lth = docume

2025-02-22
Introduction to the usage example of array Array in JS

new Array() new Array(len) new Array([item0,[item1,[item2,...]]]] Method to use array object: var objArray=new Array(); objArray.concact([

2025-02-22
Use js to determine whether the current time zone TimeZone is daylight saving time

The code copy is as follows: var d1 = new Date(2009, 0, 1); var d2 = new Date(2009, 6, 1); if (d1.getTimezoneOffset() != d2.getTimezoneOffs

2025-02-22
A brief analysis of implicit type conversion in JavaScript

If you explicitly convert a certain type to another type through a function or method call, it is called explicit conversion, and the opposite is called implicit type conversion. The words "display type conversion" and "implicit type conver

2025-02-22
Introduction to cited examples in Javascript

In Javascript scripts, the reference principle of parameters: the referenced parameters can be modified internally (such as properties), but the reference corresponding to the parameters cannot be modified. An example of a test is as follows: Copy the cod

2025-02-22
JS judgment data type, such as determining whether the array is a string, etc.

1 Determine whether it is an array type 2 Determine whether it is a string type 3 to determine whether it is numerical type. 4 Determine whether it is the date type.

2025-02-22
45 Practical Tips JavaScript Programmers Should Know

As you know, JavaScript is the number one programming language in the world, it’s the language of the web, it’s the language of mobile hybrid apps (like PhoneGap or Appcelerator), it’s the language of the server side (like NodeJS or Wakanda)

2025-02-22
JavaScript form validates phone number through regular expression

JavaScript form validates the phone number and determines whether an input quantity is a phone number, which is implemented through regular expressions. Copy the code code as follows: //Check the phone number function isTel(str){ var reg=/^([0-9]|[/-])+$/

2025-02-22
IFRAME window height adaptive implementation method

There is a page in Domaina. INDEX.HTML, which is nested with a page in Domainb. Other.html is displayed in the IFRame.html page, and its page content will increase or decrease dynamically. Now it is necessary to remove the IFRAME rolling bar. Due to J

2025-02-22
Sample code for implementing the automatic matching function of Baidu input box in JS

Many websites now have this effect. Enter a character in the text box, and the matching content will appear below. This code demonstrates how this function is completed. Of course, this is static. You can use the prompt content from When reading the datab

2025-02-22
Enter to directly realize the effect of clicking a button, which will trigger the click event

Copy the code as follows: //Enter triggers the click event of a button<input name="" type="text" id="searchkey" onkeydown="globelQuery(event);"/>

2025-02-22
js gets and clears the value of input type="file" (sample code)

Upload control (<input type="file"/> ) is used to browse and upload files on the client side. The path selected by the user can be obtained by the value attribute, but the value attribute is read-only and cannot be assigned through javascript, which makes

2025-02-22

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