echarts饼状图

function BarChart(elementId){
     //初始化echarts实例
      var myChart = echarts.init(document.getElementById(elementId));   
     // 指定图表的配置项和数据
        var option = {
            title: {
                text: '成绩'
            },
            tooltip: {
                trigger: 'item',
                formatter: "{a} <br/>{b}: {c} ({d}%)"
            },
            color:['#00B55A','#8CCC57','#999999','#FF0000','#CC0000'],
            legend: {
              data:['英语','数学','语文','物理','化学'],  
            },
            series: [{
                name: '成绩',
                type: 'pie',
                radius: ['30%', '60%'],
                data: [{value:90,name:'英语'} ,{value:80,name:'数学'},{value:95,name:'语文'},{value:85,name:'物理'},{value:90,name:'化学'}]
            }
            ],
            label: {
                normal: {
                    position: 'inner',
                    formatter: '{c}'
                }
            }
        }
        myChart.clear();
    myChart.setOption(option,true);
     }
BarChart("docmId")