echarts折线图

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: ''
            },
            tooltip: {
                 axisPointer : {            // 坐标轴指示器，坐标轴触发有效
             type : 'shadow'   // 默认为直线，可选为：'line' | 'shadow'
          }
            },
            legend: {
                data:['成绩']
            },
            xAxis: {
                data: ["英语","数学","语文","物理","化学"],
                //interval :10
            },
            yAxis: {
                 type : 'value',
                 name:'成绩',
                 min: 0,
                 max: 100,
            },
            series: [{
                name: '成绩',
                type: 'line',
                color: 'blue',
                data: [90, 80, 95, 85, 90]
            }]
        }
        myChart.clear();
    myChart.setOption(option,true);
     }    
   BarChart("domId")

/*

  series: [  //统一设置圈圈与线的颜色
                        {  
                            name:'销售量',  
                            type:'line',  
                            stack: '销售量',  
                            itemStyle : {  
                                normal : {  
                                    color:'#00FF00',  //圈圈的颜色
                                    lineStyle:{  
                                        color:'#00FF00'  //线的颜色
                                    }  
                                }  
                            },  
                            data:[220, 132, 601, 314, 890, 230, 510]  
                        }  
                    ] 

*/