This article mainly introduces how to determine if Javascript is ie. If you need it, you can refer to the third method below for test availability.
First:
The Code is as follows:
If (window. addEventListener ){Alert ("not ie ");} Else if (window. attachEvent ){Alert ("is ie ");} Else {Alert ("this happens when th
This article mainly introduces three methods to determine whether an image is loaded by using JavaScript. This article describes three methods: onload method, javascept native method, and jquery method, for more information, see. sometimes, in front-end development, to obtain image information, you must obtain the size and size of the image after the image is loa
Javascript is used to determine whether the client is a PC or a handheld device. Sometimes it is required in a project for convenient detection. There are two methods for source generation:
The Code is as follows:
Function IsPC (){Var userAgentInfo = navigator. userAgent;V
This article mainly introduces how to use the ActiveXObject object of JavaScript to check whether the application is installed. If you need it, you can refer to your own internal program and call the external protocol for normal use, however, the external protocol must work with a client. Therefore, you can use js to determine whether the client is installed. If
This article mainly introduces four methods for determining whether JavaScript is a number or not and compares the efficiency. This article provides a direct method to determine whether the code and running efficiency can be used for your convenience, for more information about how to determine the efficiency of chrome, see the following figure:
Note: Regular expressions can only be used to determine wheth
The FormatDate function is output in the time format in javascript. The time format is formatdate.
This example describes how to output the FormatDate function in time format in javascript. Share it with you for your reference. The details are as follows:
Javascript does not
Su-MO OrangeLinks: https://www.zhihu.com/question/27114726/answer/35481766Source: KnowCopyright belongs to the author. Commercial reprint please contact the author for authorization, non-commercial reprint please specify the source.Before the first time to see this part of the time is also a bit foggy, today saw the subject asked this question and carefully looked again, consulted the relevant information, now is
This article describes how to dynamically generate iframe in javascript compatible with mainstream browsers. If you need it, you can refer to the following code and run it in IE8. An error occurs in IE9:
The Code is as follows:
Document. createElement ('');
Error message: exception: SCRIPT5022: DOM Exception: INVALID_CHARACTER_ERR (5)
Train of Thought Analysis:Step 1: compatible with IE9, firefox, Opera,
Window. event. keyCode is compatible with the specific implementation code of IE and Firefox as follows. If you are interested, refer to the following HTML code.
The Code is as follows:
Javascript code
The Code is as follows:
Function keyNumAll (evt ){// Compatible with IE and Firefox to obtain keyBoardE
This article describes how to use javascript to load the document and then execute the code. it is very simple and practical. For more information, see. When performing some operations, you need to execute the file after the file is fully loaded. Otherwise, you may not be interested. first look at the code example:
Foot home
How can I use javascript to determine whether the requested url/link is valid (connectable and available )? Introduction There is an address book system deployed on several servers at the same time, but there is a Address Book link on the home page to link to this system. the problem
The prototype in JavaScript is completely parsed, and the prototype is prototype.
To understand prototype in JS, you must first understand the following concepts:1. Everything in JS is an object
2. All things in JS are derived from objects, that is, the end point of the prot
Javascript checks whether the window is closed before the current window is closed.
Check whether the current window is closed before closing the current window
In ie9, if the document is refreshed, both unloadform and onbeforeunload will be executed. If the page
Javascript verifies whether the URL entered by the user is null and the format is correct. javascripturl
Copy codeThe Code is as follows:Copy codeThe Code is as follows:
URL:PHP checks URL address Validity
The Code is as follows:C
This example describes a method for invoking a callback function after a JavaScript control picture is loaded. Share to everyone for your reference. The specific analysis is as follows:
This code can control the execution of the specified callback function after the picture loading is complete in the specified range.
Write a JavaScript function checknull () to determine if the form element is empty if the control returns falseForm code:Is there JavaScript to determine if the form element is empty
When Javascript is used to scroll a page, the DIV is fixed to the top when it reaches the top. The effect in IE is a little flash. The specific code is as follows. If you are interested, refer to the example below. When Javascript
When Javascript is used to scroll a page, the DIV is fixed to the top when it reaches the top. The effect in IE is a little flash. The specific code is as follows. If you are interested, refer to the example below. When Javascript
properties of O. So this time by P to call the F method, this point is P, which is the object prototype pattern. This is the prototype inheritance pattern in JavaScript. This with getter and setterAgain, the same concept applies to getter and setter. A function uses a getter or setter to bind to an object's propertie
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