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Javascript tutorial

JS replace method

Definition and Usage The replace() method is used to replace some characters with other characters in a string, or replace a substring that matches a regular expression. [Ctrl+A Select all Note: If you need to introduce external Js, you need to refresh be

2025-01-26
Specific implementation of httpclient simulated login (use js to set cookie)

httpclient simulates login (use js to set cookies) Copy the code as follows:<html><meta http-equiv='Content-Type' content='text/html; charset=gb2312'>

2025-01-26
Detailed analysis of the implementation of various trims in Javascript

This is an interview question from lgzx company. It requires adding a method to the String of js to remove the whitespace characters (including spaces, tabs, form feeds, etc.) on both sides of the string. Copy the code as follows: String.prototype.trim =

2025-01-26
Random example of random function that generates random numbers in js

JavaScript Math.random() built-in function random function return value returns a pseudo-random number between 0 and 1, which may be 0, but is always less than 1, [0,1) random function example //returns a random number document.write( Math.random());

2025-01-26
Analysis of usage examples of for in in js

for(var i=0;i

2025-01-26
An in-depth analysis of the role of top in js

Every WINDOW object, whether it is a regular HTML page. Frameset page. Whether a child frame or a grandchild frame, both have a TOP attribute. This property returns a reference to the top-level WINDOE object loaded into the browser; . If the WINDOW object

2025-01-26
Detailed analysis of js clipboard application clipboardData

Note: IE7 and IE8 have copy permissions for web pages. You need to set the clipboardData object in the "Custom Level" script in "Security" to provide access to the clipboard. Three methods 1.clearData(sDataFormat) deletes the data in t

2025-01-26
js implements array deduplication and determines whether the contents of arrays and objects are the same

Copy the code as follows: /* *Remove duplicate array elements*/ if(typeof Array.prototype.distinct != "function"){ Array.prototype.distinct = function(){ this.s

2025-01-26
js login popup layer special effects

Copy the code code as follows:

2025-01-26
Introduction to the use of Javascript rounding Math.round() and Math.pow()

Copy the code code as follows:

2025-01-26
Example of using mixins to implement multiple inheritance in ExtJS4

Use mixins to implement multiple inheritance in ExtJS4. The specific example code is as follows: Copy the code as follows: (function(){ Ext.onReady(function(){ Ext.define('say',{ canSay:function(){ al

2025-01-26
The difference between two ways of writing JavaScript to determine whether a variable is undefined

At work, we often need to determine whether a variable/property is undefined. There are usually two ways to copy the code. The code is as follows: // Method 1 typeof age === 'undefined'; // Method 2 age === undefined What is the difference between

2025-01-26
Detailed explanation of decimal point multiplication and division problems in javascript(js)

1. What is the result of using js to calculate 12.32 * 7? Answer: 86.24000000000001 Why does this problem occur? How to solve it? There is a bug in js when dealing with multiplication and division of decimals. The solution can be: convert decimals into in

2025-01-26
A method written in js to view the large image after uploading the image

After querying the image, we also need to add a function to view the large image, so we wrote a method in js, and then called this method in the onmouseover event of the image, so that when the mouse hovers over the small image, the large image will be di

2025-01-26
Example introduction to using requires in ExtJS4

ExtJS4's requires is a new mechanism, mainly to implement asynchronous loading mechanism. In this way, the corresponding js file will not be loaded unless the corresponding button or option is clicked, which improves the loading speed and user waiting

2025-01-26

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