XMLHttpRequest状态为0，但responseText正确

Question

I have the following HTML file, test.html : 我有以下HTML文件test.html ：

<html>
<head>
<title>Test</title>
</head>
<body>
<p>This is a test</p>
</body>
</html>

From the console, on a separate file in the same directory, I enter 从控制台，在同一目录中的单独文件中，输入

var request = new XMLHttpRequest();
request.open("GET", "test.html", true);
request.send(null);

Now, request.responseText contains the contents of the HTML file, but request.status and request.statusText are 0 and "" respectively. 现在， request.responseText包含HTML文件的内容，但是request.status和request.statusText分别为0和“”。 I've seen a hundred questions with the responseText being empty and the status 0, but I can't find anything with the responseText acting correctly and the statusText not. 我已经看到了一百个问题，其中responseText为空且状态为0，但是我找不到任何内容，而responseText行为正确，而statusText不是。 Why might this be happening? 为什么会这样呢？ Any ideas? 有任何想法吗？

Answer 1

Learn the basics 学习基础

Before you START programming for Web you should understand what is HTTP , WebServer , Client , Protocol , Request , Response and Status Code . 在开始为Web编程之前，您应该了解什么是HTTP ， WebServer ，客户端，协议，请求，响应和状态代码。

Protocol file vs http 协议文件与http

Protocol file:// don't work with XMLHttpRequest by browser security, prefer http:// . 由于浏览器的安全性，协议file://不能与XMLHttpRequest ，而是使用http:// 。 For use http:// in your PC/Machine install Apache or Nginx 要在PC /机器中使用http:// ，请安装Apache或Nginx

You use PHP, .NET, Java (jsp or jsf) or something? 您使用PHP，.NET，Java（jsp或jsf）或其他工具？

To start working with "WEB" is advisable to know a programming language and perhaps a framework: 建议您开始使用“ WEB”，以了解一种编程语言，甚至是一个框架：

Django (Python FrameWork) install Django 1.6.2 Django（Python FrameWork）安装Django 1.6.2
Django+Windows Django的+的Windows
PHP+Windows install Wamp PHP + Windows安装Wamp
PHP+Linux (or Windows) install Xampp PHP + Linux（或Windows）安装Xampp
ASP.NET (asp.net is a framework, you can programing in C# or VB ) install Microsoft ASP.NET ASP.NET（asp.net是一个框架，可以使用C＃或VB进行编程）安装Microsoft ASP.NET
JSF2 (Java is language and Facelets is "template"): http://balusc.blogspot.com.br/2011/01/jsf-20-tutorial-with-eclipse-and.html JSF2（Java是语言，而Facelets是“模板”）： http ://balusc.blogspot.com.br/2011/01/jsf-20-tutorial-with-eclipse-and.html
Rails (Ruby is language and Rails is "Framework"): http://rubyonrails.org/ Rails（Ruby是语言，Rails是“框架”）： http : //rubyonrails.org/

Ajax vs Sjax 阿贾克斯vs贾克斯

Ajax in Async-mode requires onreadystatechange 异步模式下的Ajax需要onreadystatechange

Ajax ( "A"synchronous Javascript and XML ): Ajax（ “ A”同步Javascript和XML ）：

var request = new XMLHttpRequest();
request.open("GET", "test.html", true);//true is "async"

request.onreadystatechange = function (event) {
    if (request.readyState==4) {
        console.log("status: "+request.status);
        console.log("response: "+request.responseText);
    }
};
request.send(null);

"SJAX" ("S"ynchronous Javascript and XML): “ SJAX”（“ S”同步Java语言和XML）：

var request = new XMLHttpRequest();
request.open("GET", "test.html", false);//false is "sync"
request.send(null);
if (request.readyState==4) {
    console.log("status: "+request.status);
    console.log("response: "+request.responseText);
}

Prefer asynchronous mode, so that you can work multiple events without a need to wait for the other and also avoid freezing the "javascript". 首选异步模式，这样您就可以处理多个事件，而无需等待其他事件，并且还避免冻结“ javascript”。

XMLHttpRequest状态为0，但responseText正确

问题描述

1 个解决方案

解决方案1
1 已采纳 2014-04-13 02:31:37

Learn the basics 学习基础

Protocol file vs http 协议文件与http

You use PHP, .NET, Java (jsp or jsf) or something? 您使用PHP，.NET，Java（jsp或jsf）或其他工具？

Ajax vs Sjax 阿贾克斯vs贾克斯

XMLHttpRequest状态为0，但responseText正确

问题描述

1 个解决方案

解决方案1 1 已采纳 2014-04-13 02:31:37

Learn the basics 学习基础

Protocol file vs http 协议文件与http

You use PHP, .NET, Java (jsp or jsf) or something? 您使用PHP，.NET，Java（jsp或jsf）或其他工具？

Ajax vs Sjax 阿贾克斯vs贾克斯

解决方案1
1 已采纳 2014-04-13 02:31:37