xmlhttprequest | 易学教程

Deadly CORS when http://localhost is the origin

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问题 I am stuck with this CORS problem, even though I set the server (nginx/node.js) with the appropriate headers. I can see in Chrome Network pane -> Response Headers: Access-Control-Allow-Origin:http://localhost which should do the trick. Here's the code that I now use to test: var xhr = new XMLHttpRequest(); xhr.onload = function() { console.log('xhr loaded'); }; xhr.open('GET', 'http://stackoverflow.com/'); xhr.send(); I get XMLHttpRequest cannot load http://stackoverflow.com/. Origin http:/

Deadly CORS when http://localhost is the origin

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仅用 10 天设计的 JavaScript，凭什么成为程序员最受欢迎的编程语言？

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在这个世纪之交诞生的 JavaScript，没人想到会发展为当今世界上最流行的语言之一。它不够成熟，不够严肃，甚至连名字都是模仿的 Java。那么，JavaScript 的成功是依靠运气和完美时机的侥幸吗？其实不然——即使技术不具备卓越的影响力，但事实证明，只要足够好用就可以了。以下为译文：如果你在1999年预测到，JavaScript将在20年后成为世界上最流行的语言之一，你要么有通灵术，要么是个疯子。在这个世纪之交诞生的JavaScript不仅仅无法做到一个专业语言所能做到的一切，它甚至没有被设计成一个严肃的编程语言。毕竟，需要创建Web应用程序的开发人员已经有了他们喜欢使用的成熟工具。那就是Java，通过applet嵌入系统。但是在1995年，网络浏览器先驱网景（Netscape）公司意识到，他们需要为人们提供一个更简单的选择。那时候他们处境艰难，与微软的市场大战正在紧锣密鼓，即将与Sun微系统公司达成重大战略合作伙伴关系，时间紧迫。他们雇佣了布兰登·艾奇（Brendan Eich），要求他尽可能快地创造一种新的语言。他在10天内就完成了JavaScript的第一个版本，正好赶上了这个漂亮的浏览器： Netscape 2: JavaScript的首次登场艾奇真正想做的是构建一个像Scheme这样的学术编程语言的浏览器托管版本（网页脚本语言），但网景公司的愿景与此不同

创建 XMLHttpRequest 对象时IE的兼容问题解决办法

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为了应对所有的现代浏览器，包括 IE5 和 IE6，请检查浏览器是否支持 XMLHttpRequest 对象。如果支持，则创建 XMLHttpRequest 对象。如果不支持，则创建 ActiveXObject : 实例 var xmlhttp; if (window.XMLHttpRequest) {// code for IE7 , Firefox, Chrome, Opera, Safari xmlhttp=new XMLHttpRequest(); } else {// code for IE6, IE5 xmlhttp=new ActiveXObject("Microsoft.XMLHTTP"); } 来源： CSDN 作者：会做饭的技术男链接： https://blog.csdn.net/u011927449/article/details/103527467

xmlhttprequest not firing response event handler for ready state 3 when using flush from php

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问题 I am sending a request a remote server from google chrom extension using xmlhttprequest I have set permissions in the manifest.json to access remote hosts Basically it is working fine as expected. what i had expected is readystate 4 it is fired when the response has completed. Since it is a 8 to 10 second process in the server side i use echo from the server side to the client for status update. so i use readyState==3 condition to show server response but when i tested readystate 1 and 4 are

Macro / VBA to fetch values from www.Eppraisal.com

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问题 I need to fetch some values from www.Eppraisa.com using Excel Macro. But I don't know what should be the value of PropID. That's why the macro works for URL1 but not for URL2 because I think URL2 has a wrong propID Const URL1 As String = "http://www.eppraisal.com/home-values/property_lookup_eppraisal?a=1122%20E%20Loyola%20Dr&z=85282&propid=42382460" Const URL2 As String = "http://www.eppraisal.com/home-values/property_lookup_eppraisal?a=19732%20E%20Reins%20Rd&z=85142&propid=31402642" Sub

XPCOM: sniff HTTP responses

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问题 I would like to write a little component with XPCOM that can sniff all HTTP responses received by the browser. Right now the only examples that I can find (like the one appended below) only allow me to retrieve the response for a request that I fire myself: var req = new XMLHttpRequest(); req.open('GET', 'http://www.mozilla.org/', true); req.onreadystatechange = function (aEvt) { if (req.readyState == 4) { if(req.status == 200) dump(req.responseText); else dump("Error loading page\n"); } };

Trying to keep track of number of outstanding AJAX requests in firefox

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问题 I am using Selenium to test a web application and am not allowed to modify the application's javascript code. I am trying to track the number of outstanding AJAX requests by using GreaseMonkey to override XMLHttpRequest.send. The new send() will basically wrap what was set as the onreadystatechange callback, check the readyState, incrementing or decrementing the counter as appropriate, and calling the original callback function. The problem that I'm having appears to be a privilege issue

WHY is synchronous XMLHttpRequest considered as deprecated? [closed]

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问题 Closed . This question is opinion-based. It is not currently accepting answers. Want to improve this question? Update the question so it can be answered with facts and citations by editing this post. Closed 4 years ago . I already know the difference between synchronous and asynchronous requests, like explained here for example: Synchronous and asynchronous requests When you try to make a synchronous XMLHttpRequest (with firefox for example), you get this famous warning: Synchronous

Optimal way to extract a URL from web page loaded via XMLHTTPRequest?

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问题 Problem Overview I have a dynamically produced web page, X , which consists of search results linking to web pages, Y1 , Y2 , Y3 etc. Y1 contains a resource URL R1 , Y2 contains resource URL R2 , and so on. I would like to dynamically enhance page X with links to resources R1 , R2 etc. Possible Solution I'm currently thinking of using JavaScript and XMLHTTPRequest to retrieve the HTML from web pages Y1 , Y2 , etc., and to then use a regular expression to extract the URL . Pages Y1 , Y2 , etc.