隐藏iframe无刷新上传文件，iframe刷新上传文件

首先ajax不能上传文件，这误导了我有段时间，今晚睡不着就照着说明做了个无刷新上传文件
其实原理很简单

<img src="http://www.bkjia.com/uploads/allimg/160303/1A0226225-0.gif" alt="" /></span>
<pre class="code">class upload<br />{<br />   public $_file;<br /><br />   public function __construct( $name =null)<br />   {<br />       if(is_null($name) || !isset($_FILES[$name]))<br />            $name = key($_FILES);<br />            <br />       if(!isset($_FILES[$name]))<br />           throw new Exception("并没有文件上传");<br />           <br />       $this->_file  = $_FILES[$name];<br />       <br />       if(!is_uploaded_file($this->_file['tmp_name']))<br />            throw new Exception("异常情况");<br />       if($this->_file['error'] !== 0)<br />            throw new Exception("错误代码:".$this->_file['error']);     <br />   }<br />   public function moveTo( $new_dir)<br />   {<br />       $real_dir = $this->checkDir($new_dir);<br />       return move_uploaded_file($this->_file['tmp_name'], $real_dir.'/'.$this->_file['name']);<br />   }<br />   private function checkDir($dir)<br />   {<br />       $real_dir = realpath($dir);<br />       if($real_dir === false)<br />           throw new Exception("给定目录{$dir}不存在");<br />       if(!is_writable($real_dir))<br />           throw new Exception("给定目录{$dir}不可写");<br />       return $real_dir;<br />   }</pre>
<pre class="code">}</pre>
<span class="cnblogs_code_copy"><img src="http://www.bkjia.com/uploads/allimg/160303/1A0226225-0.gif" alt="" /></span>

<p>调用示例：</p>

<pre class="code">$inputName =  'uploadfile'; <br /> // 即<input type=&ldquo;file" name="uploadfile" /> 中的name值，不填也行<br />$upload = new upload($inputName);<br />$new_dir = "/www";  // 将文件移动到的路径<br />$upload->moveTo($new_dir);</pre>

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