anchor.diff:    var refreshRevertButton = function() {
       var button = $('#revert-button');
       cd.setTip(button, function() {
  -      var tip = 'Revert to ' + param.avatar + ' '  + param.nowTag;
  +      var tip = 'revert to ' + param.avatar + ' '  + param.nowTag;
         cd.showHoverTip(button, tip);
       });
     };
  
positive.code:   var refreshDownloadButton = function() {
      var button = $('#download-button');
      cd.setTip(button, function() {
        var tip = 'Download files from ' + param.avatar + ' ' + param.nowTag;
        cd.showHoverTip(button, tip);
      });
    };
  
negative.code:   var refreshForkButton = function() {
      var button = $('#fork-button');
      cd.setTip(button, function() {
        var tip = 'setup a new session from ' + param.avatar + ' ' + param.nowTag;
        cd.showHoverTip(button, tip);
      });
    };
  