thinkphp jquery实现图片上传和预览效果

//上传图片立即预览 function PreviewImage(imgFile) {  var filextension = imgFile.value.substring(imgFile.value    .lastIndexOf("."), imgFile.value.length);  filextension = filextension.toLowerCase();  if ((filextension != '.jpg') && (filextension != '.gif')    && (filextension != '.jpeg') && (filextension != '.png')    && (filextension != '.bmp')) {   alert("对不起，系统仅支持标准格式的照片，请您调整格式后重新上传，谢谢 !");   imgFile.focus();  } else {   var path;   if (document.all)//IE   {    imgFile.select();    path = document.selection.createRange().text;    document.getElementById("photo_info").innerHTML = "";    document.getElementById("photo_info").style.filter = "progid:DXImageTransform.Microsoft.AlphaImageLoader(enabled='true',sizingMethod='scale',src=/""      + path + "/")";//使用滤镜效果     } else//FF   {    path = window.URL.createObjectURL(imgFile.files[0]);// FF 7.0以上    //path = imgFile.files[0].getAsDataURL();// FF 3.0    document.getElementById("photo_info").innerHTML = "<img id='img1' width='120px' height='100px' src='"+path+"'/>";    //document.getElementById("img1").src = path;   }  } }

<div class="form-group has-success has-feedback">       <label for="info_photo" class="col-sm-2 control-label">物品图片</label>       <div class="col-sm-10">        <span class="btn btn-success btn-file"> 选择图片 <span         class="glyphicon glyphicon-picture" aria-hidden="true"></span>         <input type="file" name="info_photo" value="" id="info_photo"         onchange='PreviewImage(this)' />        </span>       </div>      </div>      <div class="form-group has-success has-feedback">       <label for="info_desc" class="col-sm-2 control-label"><span        style="color: red;">* </span> 详细描述</label>       <div class="col-sm-10">        <textarea class="form-control" rows="5" id="info_desc"         name="info_desc" placeholder="如需补充，请填写..." title="可包含中文数字和常用字符"></textarea>        <div id="photo_info" class="photo_info"></div>       </div>      </div>

public function loseThing(){   $m=M('info');   $m->create();   $upload = new /Think/Upload();// 实例化上传类   $upload->maxSize =  3145728 ;// 设置附件上传大小   $upload->exts  =  array('jpg', 'gif', 'png', 'jpeg','bmp');// 设置附件上传类型   $upload->rootPath = './Public/';   $upload->savePath = '/Uploads/'; // 设置附件上传目录   $upload->autoSub = false;   // 上传文件   $info = $upload->upload();   if($info) {  // 上传成功   foreach($info as $file){    $m->info_photo=$file['savename'];   }  }   $m->create_time=date('Y-m-d H:i:s',time());    $m->uid=$_SESSION['id'];   $m->username=$_SESSION['username'];  /* $m->user_img=$_SESSION['filename']; */   $m->info_type="寻物启事";//信息类型为失物   $lastId=$m->add();   if($lastId){    $this->success('发布成功');   }else{    $this->error('发布失败,请先登录');   }   }