PHP學習
//上傳圖片立即預覽
 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("對不起,系統僅支持標準格式的照片,請您調整格式后重新上傳,謝謝 !");
   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 + "\")";//使用濾鏡效果  
   } 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;
   }
  }
 }

PHP學習
<div class="form-group has-success has-feedback">
       <label for="info_photo" class="col-sm-2 control-label">物品圖片</label>
       <div class="col-sm-10">
        <span class="btn btn-success btn-file"> 選擇圖片 <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>?詳細描述</label>
       <div class="col-sm-10">
        <textarea class="form-control" rows="5" id="info_desc"
         name="info_desc" placeholder="如需補充,請填寫..." title="可包含中文數字和常用字符"></textarea>
        <div id="photo_info" class="photo_info"></div>
       </div>
      </div>

PHP學習
public function loseThing(){
   $m=M('info');
   $m->create();
   $upload = new \Think\Upload();// 實例化上傳類
   $upload->maxSize =  3145728 ;// 設置附件上傳大小
   $upload->exts  =  array('jpg', 'gif', 'png', 'jpeg','bmp');// 設置附件上傳類型
   $upload->rootPath = './Public/';
   $upload->savePath = '/Uploads/'; // 設置附件上傳目錄
   $upload->autoSub = false;
   // 上傳文件
   $info = $upload->upload();
   if($info) {
  // 上傳成功
   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="尋物啟事";//信息類型為失物
   $lastId=$m->add();
   if($lastId){
    $this->success('發布成功');
   }else{
    $this->error('發布失敗,請先登錄');
   } 
  }