文件上传接口

public function commonUpload()
{
   $uploadDir = sprintf( './Public/Uploads/%s/',date('Ym') );
   if ( !is_dir($uploadDir) ){
           mkdir($uploadDir,0777,true);
       }
       $upload = new \Think\Upload();
       $upload->maxSize = 3145728;
       $upload->exts    = [
           'doc','docx','xls','xlsx','pdf','txt','jpg','png'
       ];
       $upload->rootPath = $uploadDir;
       $upload->saveName = array('uniqid','');
       $upload->savePath = '';
       $upload->subName  = [];
       $info = $upload->uploadOne($_FILES['file']);
       if ( empty($info) ) {
           $this->ajaxReturn([
               'code' => 500,
               'msg'  => '上传失败：' . $upload->getError(),
               'data' => ''
           ]);
       }
       $this->ajaxReturn([
           'code' => 200,
           'msg'  => '上传成功',
           'data' => [
               'name'     => $info['name'],
               'saveName' => sprintf( '/Company_admin/Enterprise_purchase/Public/Uploads/%s/%s',date('Ym'),$info['savename'] )
           ]
       ]);
}