有带+号的作业无法打包下载的问题

public/javascripts/application.js

@@ -880,7 +880,8 @@ $(function(){
             }
 
             if(res.length==1){
-                location.href = '/zipdown/download?file='+res[0].file;return;
+                var file = encodeURI(res[0].file).replace(/\+/g, '%2B');
+                location.href = '/zipdown/download?file='+file;return;
             }
 
             document.getElementById('light').style.display='block';