jQuery传递数据同时上传文件到php后台的问题
php数据jquery
各位大神们好，我是一名学生正在自学编程，一段手机上传图片程序如下：
1.前端有一个上传框，上传图片后会自动生成预览图
2.如下程序是部分js文件，一些无关的代码已经删掉了，
3.后台post.php页面用post方法或者file方法都收不到上传的文件，text文本数据可以收到
4.前端有获得 $("#picture").val() 的代码，我这个js是不是没有把文件传成功啊？少了点什么呢？ 预览图可以正常生成！求大神们指点一二，小弟感激不尽！
<code> function postTopic(){ var cid = $('#cid').val(); if( parseInt(cid) 500 ) { $('textarea[name=message]').focus(); return false; } var picture = ""; if( $("#picture").val() == "" ) { if( msg.length </code>
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