解决ajax+php中文乱码的方法详解
中文如果用表单提交的话，不会出现乱码，而用ajax提交就会出现乱码，这是什么原因呢？
我的理解是，我在写源码的时候，一般用记事本写，保存的时候默认用ANSI编码，源码中也没有用“”或“header('Content-Type:text/html;charset=UTF-8');”指定网页编码，于是在浏览器中显示时它的编码被认定为“GB2312”。当前台向后台传递数据的时候，用表单提交的话，前后台之间用“GB2312”编码交流，不会出现乱码；而用ajax提交的话，ajax在前台把要发送的数据编码从“GB2312”转换 成“UTF-8”后再传给后台，然后再把接收到的后台返回的数据当成是 “UTF-8”而把它转换 成“GB2312”后显示在前台页面上，这样乱码就产生了。
如图：
所以要解决乱码，要在后台进行数据编码转换，后台接收到的数据用PHP的mb_convert_encoding("要转换的数据","gb2312","UTF-8")进行转换后存储到数据库。而后台返回到前台的中文数据也要用mb_convert_encoding("要返回的数据","UTF-8","gb2312")转换后返回。
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