解决百度Echarts图表坐标轴越界的方法

    // 创建数据
    var base = +new Date(1968, 9, 3);
    var oneDay = 24 * 3600 * 1000;
    var date = [];

    var data = [Math.random() * 300];

    for (var i = 1; i < 20000; i++) {
      var now = new Date(base += oneDay);
      date.push([now.getFullYear(), now.getMonth() + 1, now.getDate()].join('/'));
      data.push(Math.round((Math.random() - 0.5) * 20 + data[i - 1]));
    }
    
    // 创建对象option
    option = {
      tooltip: {
        trigger: 'axis',
        position: function (pt) {
          return [pt[0], '10%'];
        }
      },
      title: {
        left: 'center',
        text: '大数据量面积图',
      },
      toolbox: {
        feature: {
          dataZoom: {
            yAxisIndex: 'none'
          },
          restore: {},
          saveAsImage: {}
        }
      },
      xAxis: {
        type: 'category',
        boundaryGap: false,
        data: date
      },
      yAxis: {
        type: 'value',
        boundaryGap: [0, '100%']
      },
      dataZoom: [{
        type: 'inside',
        start: 0,
        end: 10
      }, {
        start: 0,
        end: 10,
        handleIcon: 'M10.7,11.9v-1.3H9.3v1.3c-4.9,0.3-8.8,4.4-8.8,9.4c0,5,3.9,9.1,8.8,9.4v1.3h1.3v-1.3c4.9-0.3,8.8-4.4,8.8-9.4C19.5,16.3,15.6,12.2,10.7,11.9z M13.3,24.4H6.7V23h6.6V24.4z M13.3,19.6H6.7v-1.4h6.6V19.6z',
        handleSize: '80%',
        handleStyle: {
          color: '#fff',
          shadowBlur: 3,
          shadowColor: 'rgba(0, 0, 0, 0.6)',
          shadowOffsetX: 2,
          shadowOffsetY: 2
        }
      }],
      series: [
        {
          name:'模拟数据',
          type:'line',
          smooth:true,
          symbol: 'none',
          sampling: 'average',
          itemStyle: {
            color: 'rgb(255, 70, 131)'
          },
          areaStyle: {
            color: new echarts.graphic.LinearGradient(0, 0, 0, 1, [{
              offset: 0,
              color: 'rgb(255, 158, 68)'
            }, {
              offset: 1,
              color: 'rgb(255, 70, 131)'
            }])
          },
          data: data
        }
      ]
    };

// 将option数据挂载到main节点
echarts.init(document.getElementById('main')).setOption(option);

grid:{
    containLabel: true
   },