text: 
  accessid = ''
  accesskey = ''
  host = ''
  policyBase64 = ''
  signature = ''
  callbackbody = ''
  filename = ''
  key = ''
  expire = 0
  g_object_name = ''
  g_object_name_type = ''
  now = timestamp = Date.parse(new Date()) / 1000;
  var uploading = false;
  
  function send_request()
  {
      var xmlhttp = null;
      if (window.XMLHttpRequest)
      {
          xmlhttp=new XMLHttpRequest();
      }
      else if (window.ActiveXObject)
      {
          xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
      }
    
      if (xmlhttp!=null)
      {
          serverUrl = '/api/5b35f848ee47f'//访问接口获取阿里云服务端签名
          xmlhttp.open( "GET", serverUrl, false );
          xmlhttp.send( null );
          return xmlhttp.responseText
      }
      else
      {
          alert("Your browser does not support XMLHTTP.");
      }
  };
  
  function get_signature()
  {
      //可以判断当前expire是否超过了当前时间,如果超过了当前时间,就重新取一下.3s 做为缓冲
      now = timestamp = Date.parse(new Date()) / 1000; 
      if (expire < now + 3)
      {
          body = send_request()
          var obj = eval ("(" + body + ")");
          host = obj['host']
          policyBase64 = obj['policy']
          accessid = obj['accessid']
          signature = obj['signature']
          expire = parseInt(obj['expire'])
          callbackbody = obj['callback'] 
          key = obj['dir']
          return true;
      }
      return false;
  };
  
  function random_string(len) {
  　　len = len || 32;
  　　var chars = 'ABCDEFGHJKMNPQRSTWXYZabcdefhijkmnprstwxyz2345678';   
  　　var maxPos = chars.length;
  　　var pwd = '';
  　　for (i = 0; i < len; i++) {
      　　pwd += chars.charAt(Math.floor(Math.random() * maxPos));
      }
      return pwd;
  }
  
  function get_suffix(filename) {
      pos = filename.lastIndexOf('.')
      suffix = ''
      if (pos != -1) {
          suffix = filename.substring(pos)
      }
      return suffix;
  }
  
  function calculate_object_name(filename)
  {
      if (g_object_name_type == 'local_name')
      {
          g_object_name += "${filename}"
      }
      else if (g_object_name_type == 'random_name')
      {
          suffix = get_suffix(filename)
          g_object_name = key + random_string(10) + suffix
      }
      return ''
  }
  
  function get_uploaded_object_name(filename)
  {
      if (g_object_name_type == 'local_name')
      {
          tmp_name = g_object_name
          tmp_name = tmp_name.replace("${filename}", filename);
          return tmp_name
      }
      else if(g_object_name_type == 'random_name')
      {
          return g_object_name
      }
  }
  
  function set_upload_param(up, filename, ret)
  {
      if (ret == false)
      {
          ret = get_signature()
      }
      g_object_name = key;
      if (filename != '') {
          suffix = get_suffix(filename)
          calculate_object_name(filename)
      }
      new_multipart_params = {
          'key' : g_object_name,
          'policy': policyBase64,
          'OSSAccessKeyId': accessid, 
          'success_action_status' : '200', //让服务端返回200,不然，默认会返回204
          'callback' : callbackbody,
          'signature': signature,
      };
  
      up.setOption({
          'url': host,
          'multipart_params': new_multipart_params
      });
  
      up.start();
  }
  
  var uploader = new plupload.Uploader({
  	runtimes : 'html5,flash,silverlight,html4',
  	browse_button : 'selectfiles', 
      multi_selection: false,
  	container: document.getElementById('container'),
  	flash_swf_url : 'plupload-2.1.2/js/Moxie.swf',
  	silverlight_xap_url : 'plupload-2.1.2/js/Moxie.xap',
      url : 'http://oss.aliyuncs.com',
  
      filters: {
          mime_types : [ //只允许上传图片和zip,rar文件
          { title : "video files", extensions : "mp4,flv,mov" }
          ],
          max_file_size : '1024mb', //最大只能上传1G的文件
          prevent_duplicates : true //不允许选取重复文件
      },
  
  	init: {
  		PostInit: function() {
  			document.getElementById('postfiles').onclick = function() {
                  if(!uploading){
                      uploading = true;
                      this.disabled=true;
                      set_upload_param(uploader, '', false);
                  }
  				return false;
  			};
  		},
  
  		FilesAdded: function(up, files) {
  			document.getElementById('ossfile').innerHTML = '';
  			plupload.each(files, function(file) {
  				document.getElementById('ossfile').innerHTML += '<div id="' + file.id + '">' + file.name + ' (' + plupload.formatSize(file.size) + ')<b></b>'
  				+'<div class="progress"><div class="progress-bar" style="width: 0%"></div></div>'
  				+'</div>';
  			});
  		},
  
  		BeforeUpload: function(up, file) {
  			 //var url = URL.createObjectURL(file);  
  			
  		
  
              g_object_name_type = 'random_name';//使用原名称,random_name使用随机名称
              set_upload_param(up, file.name, true);
  			$.post(dolphin.file_upload_url, { filename: file.name, url: get_uploaded_object_name(file.name),size:file.size,module:'teacher' },function(data){
  				var get_dom = $('#get_dom').val();
  				$('#'+get_dom).val(data.id);
  			});
          },
  
  		UploadProgress: function(up, file) {
  			var d = document.getElementById(file.id);
  			d.getElementsByTagName('b')[0].innerHTML = '<span>' + file.percent + "%</span>";
              var prog = d.getElementsByTagName('div')[0];
  			var progBar = prog.getElementsByTagName('div')[0]
  			progBar.style.width=file.percent+'%';
  			progBar.setAttribute('aria-valuenow', file.percent);
  		},
  
  		FileUploaded: function(up, file, info) {
              if (info.status == 200)
              {
                  uploading = false;
  				layer.msg('上传成功，请保存课时吧');
                  //document.getElementById('postfiles').disabled=false;
  				//document.getElementById('ossfile').innerHTML = '<p>'+file.name+' <font color="red">上传成功，请保存课时吧！</font></p>';
              }
              else
              {
                  document.getElementById(file.id).getElementsByTagName('b')[0].innerHTML = info.response;
              } 
  		},
  
  		Error: function(up, err) {
  			if (err.code == 1) {
  				uploading = false;
  				layer.msg('上传成功，请保存课时吧');
  			}else  if (err.code == -600) {
  				layer.msg('选择的文件太大了,可以根据应用情况，在upload.js 设置一下上传的最大大小');
                  //document.getElementById('console').appendChild(document.createTextNode("\n选择的文件太大了,可以根据应用情况，在upload.js 设置一下上传的最大大小"));
              }
              else if (err.code == -601) {
  				layer.msg('选择的文件后缀不对,可以根据应用情况，在upload.js进行设置可允许的上传文件类型');
                  //document.getElementById('console').appendChild(document.createTextNode("\n选择的文件后缀不对,可以根据应用情况，在upload.js进行设置可允许的上传文件类型"));
              }
              else if (err.code == -602) {
  				layer.msg('这个文件已经上传过一遍了');
                  //document.getElementById('console').appendChild(document.createTextNode("\n这个文件已经上传过一遍了"));
              }
              else 
              {
  				layer.msg("Error xml:" + err.code);
                  // document.getElementById('console').appendChild(document.createTextNode("\nError xml:" + err.response));
              }
  		}
  	}
  });
  uploader.init();