js文件可以参考官网，或者在这里下载，引入

下面是具体方法

  var date = [],num = [];
  $(document).ready(function () {
    // 绘制反馈量图形
    var init_echarts = function () {
      var refreshChart = function (show_data) {
        my_demo_chart = echarts.init(document.getElementById('echart_show'));

        my_demo_chart.showLoading({
          text: '加载中...',
          effect: 'whirling'
        });

        var echarts_all_option = {
          title: {
            text: '',
            subtext: '用户走势'
          },
          tooltip: {
            trigger: 'axis'
          },
          legend: {
            data: ['用户数', '用户消耗']
          },
          toolbox: {
            show: true,
            feature: {
              mark: {show: true},
              dataView: {show: true, readOnly: false},
              magicType: {show: true, type: ['line', 'bar']},
              restore: {show: true},
              saveAsImage: {show: true}
//              myTool2: {
//                show: true,
//                title: '自定义扩展方法',
//                icon: 'image://http://echarts.baidu.com/images/favicon.png',
//                onclick: function (){
//                  alert('自定义')
//                }
//              }
            }
          },
          dataZoom: {
            show: false,
            start: 0,
            end: 100
          },
          xAxis: [
            {
              type: 'category',
              boundaryGap: true,
              data: show_data[1]
            },
            {
              type: 'category',
              boundaryGap: true,
              data: show_data[1]
            }
          ],
          yAxis: [
            {
              type: 'value',
              scale: true,
              name: '用户数',
              boundaryGap: [0, 0.5]
//              boundaryGap: [0.2, 0.2]
            },
            {
              type: 'value',
              scale: true,
              name: '用户数',
              boundaryGap: [0, 0.5]
            }
          ],
          series: [
            {
              name: '用户消耗',
              type: 'bar',
              xAxisIndex: 1,
              data: show_data[0]
            },
            {
              name: '用户数',
              type: 'line',
              xAxisIndex: 1,
              data:show_data[0]
            }
          ]
        };
        my_demo_chart.hideLoading();
        my_demo_chart.setOption(echarts_all_option);
      };

      // 获取原始数据
      $.ajax({
        url:"__CONTROLLER__/getRes",
        async:false,
        dataType:'json',
        type:'post',

        success:function(msg){
          var result = msg.result;
          if(msg.code == 200){
            for(var i = 0 ; i < result.length; i++){
              date.push(result[i].date);
              num.push(result[i].count);
              msg[0] = num;
              msg[1] = date;
              refreshChart(msg);
            }
          }
        }
      });
    };

    // 默认加载
    var default_load = (function () {
      init_echarts();
    })();
  });

控制器中查询自己需要的数据 （这里查询的日期和对应的数量）

//折线统计
  public function getRes(){
    $user = M('account');
    $sql = "SELECT date(createTime) AS date,count(*) as count FROM t_account GROUP BY date ";
    $result = $user->query($sql);
    $this->ajaxReturn(array('code'=>200,'result'=>$result));
  }