title: Echarts3.0 display percent on y-axis in stacked bar chart
body: <p>Using Echarts3.0 in Vuejs2.0 component, I am trying to assign percent on y-axis in  a stacked bar chart. I tried boundaryGap, splitnumber,  etc, but none of them worked.
  But i cannot achieve it, Anyone has idea how can i get % on y-axis?</p>
  
  <pre><code>export default {
    data: () =&gt; ({
      loading: true,
      bar: {              
      xAxis:  {
              type: 'category',
              data: ['Location1','Location2']
          },
      yAxis: {
              type: 'value',
             splitNumber: 10,
             boundaryGap: ['0', '100%'],
             min:0,
             max:100,
              scale:true,
              splitArea : {show : true},
              label: {
                   formatter: function(){
                   return 100 * value /$(this.axis.tickPositions).last()[0]                              
                   + '%';
                         }
                     }
              },
       series: [
              {
                  name: 'Location1',
                  type: 'bar',
                  stack: 'one',
                  label: {
                      normal: {
                          show: true,
                          position: 'insideRight'
                      }
                  },
                  data: [1100, 2050]
              },
              {
                  name: 'Location2',
                  type: 'bar',
                  stack: 'one',
                  label: {
                      normal: {
                          show: true,
                          position: 'insideRight'
                      }
                  },
                  data: [291064, 34789]
              }
          ]
          }
  </code></pre>
  
  <p>})</p>