文件下载改为base64传输

public/javascripts/application.js

@@ -931,6 +931,9 @@ $(function(){
             else
             {
                 if(res.length==1){
+                  if(res[0].base64file){
+                    location.href = encodeHomeworkUrl(res[0].base64file, true);return;
+                  }
                   location.href = encodeHomeworkUrl(res[0].file);return;
                 }
                 document.getElementById('light').style.display='block';
@@ -943,7 +946,12 @@ $(function(){
                     } else {
                         des = '第'+res[i].index+'个学生的作品下载';
                     }
+
+                  if(res[i].base64file){
+                    $('<li><span class="upload_box_span" >'+(i+1)+'.</span> <a href="'+ encodeHomeworkUrl(res[i].base64file, true) +'">'+des+'</a><span class="c_grey">&nbsp;&nbsp;（共'+res[i].size+'M）</span> </li>').appendTo($container);
+                  } else {
                     $('<li><span class="upload_box_span" >'+(i+1)+'.</span> <a href="'+ encodeHomeworkUrl(res[i].file) +'">'+des+'</a><span class="c_grey">&nbsp;&nbsp;（共'+res[i].size+'M）</span> </li>').appendTo($container);
+                  }
 
                 }
             }