Ajax缓存和编码问题的最终解决方案

ajax缓存和编码问题不难解决，下面是解决方法。 编码问题 默认使用UTF-8，如果一旦发现对象找不到的情况，可能js中输入了中文，同时js的编码格式可能为gb2312，可用记事本打开js，另存为utf-8格式的文档。 通过XMLHttpRequest获取的数据，默认的字符编码是UTF-8，如果前端页面是GB2312或者其它编码，显示获取的数据就是乱码。通过XMLHTTPRequest，POST的数据也是UTF-8编码，如果后台是GB2312或者其他编码也会出现乱码。 Cache缓存问题 由于IE的缓存处理机制问题，每次通过XMLHttpRequest访问动态页面返回的总是首次访问的内容，解决方法有： 1. 客户端通过添加随机字符串解决。如： var url = 'http://www.bothv.com/'; url += '?temp=' + new Date().getTime(); url += '?temp=' + Math.random(); 2. 在HTTP headers禁止缓存。如： HTTP: <meta http-equiv="pragma" content="no-cache" /> <meta http-equiv="Cache-Control" content="no-cache, must-revalidate" /> <meta http-equiv="expires" content="Thu, 01 Jan 1970 00:00:01 GMT" /> <meta http-equiv="expires" content="0" /> PHP： header("Expires: Thu, 01 Jan 1970 00:00:01 GMT"); header("Cache-Control: no-cache, must-revalidate"); header("Pragma: no-cache"); ASP： Response.expires=0 Response.addHeader("pragma","no-cache") Response.addHeader("Cache-Control","no-cache, must-revalidate") JSP： response.addHeader("Cache-Control", "no-cache"); response.addHeader("Expires", "Thu, 01 Jan 1970 00:00:01 GMT"); 3. 在XMLHttpRequest发送请求之前加上： XMLHttpRequest.setRequestHeader("If-Modified-Since","0"); XMLHttpRequest.send(null);     高质量的.NET空间，完美支持1.0/2.0/3.5/MVC等

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