code: function(src, data, title, flag) {
              var time = Util.getTime(), key;
              Util.stack[src] = {
                  data : data,
                  title : title,
                  time : time
              };
              if (flag && Util.support.storage) {
                  key = Util.getLocalKey(src);
                  localStorage.setItem(key.data, data);
                  localStorage.setItem(key.time, time);
                  localStorage.setItem(key.title, title);
              }
          }
docs: 设置cache