Home Web Front-end JS Tutorial Detailed explanation of js to determine whether the client can access the Internet

Detailed explanation of js to determine whether the client can access the Internet

May 09, 2018 pm 03:34 PM
javascript client Detailed explanation

This article mainly introduces js to determine whether the client can access the Internet in detail. Friends in need can refer to it.

The first one:

<script src="http://code.jquery.com/jquery-1.4.2.min.js"></script>
<script language="javascript" type="text/javascript">
   if(!window.jQuery){
         alert("能上网");
    }else{
      alert("不能上网");
  }
Copy after login

The second one:

Use js to cross domain Do

$.getScript("http://api.taobao.com/apitools/ajax_props.do?act=props&cid=50000436&restBool=false", function () {

//Put Some codes that can only be done online

);

or

//Cross-domain (can cross all domain names)
$.getJSON("http:// e.hnce.com.cn/tools/ajax.aspx?jsoncallback=?", { id: 0, action: 'jobcategoryjson' }, function(json) {

alert(json[0].pid );
alert(json[0].items[0]._name);

});


Related recommendations:

What are the methods for JS to determine json

How to use JS to determine whether the current page has scroll bars

js determines whether it is PC or mobile

The above is the detailed content of Detailed explanation of js to determine whether the client can access the Internet. For more information, please follow other related articles on the PHP Chinese website!

Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

Hot AI Tools

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress AI Tool

Undress images for free

Clothoff.io

Clothoff.io

AI clothes remover

Video Face Swap

Video Face Swap

Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Tools

Notepad++7.3.1

Notepad++7.3.1

Easy-to-use and free code editor

SublimeText3 Chinese version

SublimeText3 Chinese version

Chinese version, very easy to use

Zend Studio 13.0.1

Zend Studio 13.0.1

Powerful PHP integrated development environment

Dreamweaver CS6

Dreamweaver CS6

Visual web development tools

SublimeText3 Mac version

SublimeText3 Mac version

God-level code editing software (SublimeText3)

VMware Horizon Client cannot be opened [Fix] VMware Horizon Client cannot be opened [Fix] Feb 19, 2024 pm 11:21 PM

VMware Horizon Client helps you access virtual desktops conveniently. However, sometimes the virtual desktop infrastructure may experience startup issues. This article discusses the solutions you can take when the VMware Horizon client fails to start successfully. Why won't my VMware Horizon client open? When configuring VDI, if the VMWareHorizon client is not open, an error may occur. Please confirm that your IT administrator has provided the correct URL and credentials. If everything is fine, follow the solutions mentioned in this guide to resolve the issue. Fix VMWareHorizon Client Not Opening If VMW is not opening on your Windows computer

VMware Horizon client freezes or stalls while connecting [Fix] VMware Horizon client freezes or stalls while connecting [Fix] Mar 03, 2024 am 09:37 AM

When connecting to a VDI using the VMWareHorizon client, we may encounter situations where the application freezes during authentication or the connection blocks. This article will explore this issue and provide ways to resolve this situation. When the VMWareHorizon client experiences freezing or connection issues, there are a few things you can do to resolve the issue. Fix VMWareHorizon client freezes or gets stuck while connecting If VMWareHorizon client freezes or fails to connect on Windows 11/10, do the below mentioned solutions: Check network connection Restart Horizon client Check Horizon server status Clear client cache Fix Ho

Detailed explanation of obtaining administrator rights in Win11 Detailed explanation of obtaining administrator rights in Win11 Mar 08, 2024 pm 03:06 PM

Windows operating system is one of the most popular operating systems in the world, and its new version Win11 has attracted much attention. In the Win11 system, obtaining administrator rights is an important operation. Administrator rights allow users to perform more operations and settings on the system. This article will introduce in detail how to obtain administrator permissions in Win11 system and how to effectively manage permissions. In the Win11 system, administrator rights are divided into two types: local administrator and domain administrator. A local administrator has full administrative rights to the local computer

PHP MQTT Client Development Guide PHP MQTT Client Development Guide Mar 27, 2024 am 09:21 AM

MQTT (MessageQueuingTelemetryTransport) is a lightweight message transmission protocol commonly used for communication between IoT devices. PHP is a commonly used server-side programming language that can be used to develop MQTT clients. This article will introduce how to use PHP to develop an MQTT client and include the following content: Basic concepts of the MQTT protocol Selection and usage examples of the PHPMQTT client library: Using the PHPMQTT client to publish and

Detailed explanation of division operation in Oracle SQL Detailed explanation of division operation in Oracle SQL Mar 10, 2024 am 09:51 AM

Detailed explanation of division operation in OracleSQL In OracleSQL, division operation is a common and important mathematical operation, used to calculate the result of dividing two numbers. Division is often used in database queries, so understanding the division operation and its usage in OracleSQL is one of the essential skills for database developers. This article will discuss the relevant knowledge of division operations in OracleSQL in detail and provide specific code examples for readers' reference. 1. Division operation in OracleSQL

How to solve the problem that the Baidu Netdisk webpage cannot start the client? How to solve the problem that the Baidu Netdisk webpage cannot start the client? Mar 13, 2024 pm 05:00 PM

When many friends download files, they will first browse on the web page and then transfer to the client to download. But sometimes users will encounter the problem that the Baidu Netdisk webpage cannot start the client. In response to this problem, the editor has prepared a solution for you to solve the problem that the Baidu Netdisk webpage cannot start the client. Friends in need can refer to it. Solution: 1. Maybe Baidu Netdisk is not the latest version. Manually open the Baidu Netdisk client, click the settings button in the upper right corner, and then click version upgrade. If there is no update, the following prompt will appear. If there is an update, please follow the prompts to update. 2. The detection service program of Baidu Cloud Disk may be disabled. It is possible that we manually or use security software to automatically disable the detection service program of Baidu Cloud Disk. Please check it out

Detailed explanation of the role and usage of PHP modulo operator Detailed explanation of the role and usage of PHP modulo operator Mar 19, 2024 pm 04:33 PM

The modulo operator (%) in PHP is used to obtain the remainder of the division of two numbers. In this article, we will discuss the role and usage of the modulo operator in detail, and provide specific code examples to help readers better understand. 1. The role of the modulo operator In mathematics, when we divide an integer by another integer, we get a quotient and a remainder. For example, when we divide 10 by 3, the quotient is 3 and the remainder is 1. The modulo operator is used to obtain this remainder. 2. Usage of the modulo operator In PHP, use the % symbol to represent the modulus

Detailed explanation of the linux system call system() function Detailed explanation of the linux system call system() function Feb 22, 2024 pm 08:21 PM

Detailed explanation of Linux system call system() function System call is a very important part of the Linux operating system. It provides a way to interact with the system kernel. Among them, the system() function is one of the commonly used system call functions. This article will introduce the use of the system() function in detail and provide corresponding code examples. Basic Concepts of System Calls System calls are a way for user programs to interact with the operating system kernel. User programs request the operating system by calling system call functions

See all articles