javascript tips

Mainstream browsers support onbeforeunload events (events triggered before page uninstallation). Most websites now use this function to implement it as follows: The Code is as follows: Window. onbeforeunload = function (){Return "are you sure

JavaScript has a with keyword. the original purpose of the with statement is to provide a namespace-based write Method for hierarchical object access. that is, in the specified code area, the Java and. NET users should be familiar with the concept

Use the @ cc_on statement in Jscript to identify the IE browser and version code. For more information, see. Activation condition compilation is supported. @ Cc_on remarks @ Cc_on statement activates Conditional compilation in the script engine. We

Js monitors the status of text boxes in real time. The compatibility of the methods here is not very good. We recommend that you refer to the previous articles in the script house. The Code is as follows: Script // Function executed

We know that the standard mouse has three keys: Left, center, and right. How can I determine which key is pressed when I press the mouse? W3C DOM-Level-2 is defined as follows W3C DOM writes During mouse events caused by the depression or release of

There are three methods for clearing arrays in JavaScript. For more information, see. Method 1, splice The Code is as follows: Var ary = [1, 2, 4];Ary. splice (0, ary. length );Console. log (ary); // output [], empty array, which is cleared

When the verification code image is displayed, no random parameters are added to the image, which leads to the change in ie. The same verification code is displayed, firefox did not find this bug. Today, it has made a low-level error. When the

JS obtains and operates the element methods in iframe. For details about how to obtain and set the object elements and documents in iframe in JS, see. 1. Dedicated to IE (Image Positioning through frames index ): The Code is as follows: Document.

You may have heard about the built-in methods of array objects. Today we will mainly introduce the built-in methods of array objects in JavaScript. If you are interested, refer to the following, hope to help you learn javascript /** * This article

After the page is loaded, insert a window to the page, and insert the close button to the window. Use the setInterval () function to trigger the moves () function to start the animation js method: The Code is as follows: New Document

Exporting tables to Excel is not a difficult task and can be implemented in many languages. This article mainly introduces how to export tables to excel using JavaScript, for more information, see The Code is as follows: Function copyToExcel

Window. onresize event-specific event binder v0.1, used to solve the lteie8 & amp; chrome and other bugs that may occur when the native window. resize event is executed multiple times. The Code is as follows: /*** Window. onresize event-specific

Array. the parameter in sort () must be a function and must be an array in javascript. the parameter in sort () must be a function and must be a function. X and y represent two objects in array. Note that there are only three return types:

This script changes the font size (& lt; P & gt; label) of any text in a paragraph ). If you want to change part of the getElementsByTagName (& quot; P & quot;); edited text in other labels. To use this code to access your webpage, you must use a

So far, I guess that the javascript execution should first perform syntax analysis, and then analyze the variable table (local and global) by the way. First, let's look at the following three pieces of code: The Code is as follows: Var

I have accumulated little work knowledge and obtained the image size. For more information, see. 1. Function for obtaining image size getImageSize The Code is as follows: Function getImageSize (imageEl ){Var I = new Image (); // create an

Today, we can see the use of closures without any worries, and sort out the closure items. The definition of a closure is very obscure-a closure refers to a syntax domain located in a specific area with a continuous reference (read/write) section of

When you use JavaScript scripts to obtain the size of an element, you need to understand several attributes. Otherwise, it will be tricky. In the past, I have memorized these attributes and seldom really understood them. If I forget it, I will check

JS string Function Extension code. You can refer to the prototype usage method to expand your own string processing functions. The Code is as follows: /*************************************** ************** CreateBy: joe zhou* CreateDate: 2011-9-4

Sometimes we need to copy the content of a box or the entire table. The general operation may cause some inconvenience. First, the operation steps are relatively copied, first, when copying a table, it is easy to copy incomplete or the format is