code: function refreshScrollbar(el, options){
              var options = options ? options : {};
  
              if (options.immediate) {
                  computeVisibleArea(el);
                  computeBarTop(el);
                  computeBarHeight(el);
                  updateDragger(el);
              }
  
              Vue.nextTick(function(){
                  if ( !getState(el) ) { return false }
                  computeVisibleArea(el);
                  computeBarTop(el);
                  computeBarHeight(el);
                  updateDragger(el);
              }.bind(this));
          }
docs: /*------------------------------------*\
  Refresh
  \*------------------------------------