微信小程序中简单使用echarts图表

   1.复制组件至page同级目录下（ec-canvas）

2. 在js中引入

import * as echarts from '../../ec-canvas/echarts';

3.在wxml写个标签

样式我是这么设置的（在wcss），差不多大写微信里尺寸可以

/**数据图表样式**/
.ec-canvas {
    width: 100%;
    height: 100%;
  }
  
  .container {
    height: 35vh;
    background: white;
    border-radius: 10rpx;
  }

4.编写数据咯（数据肯定是从接口传的，我就不写死了 直接方法也贴出来）

• 先创建对象

//在page data 中定义
pptn: { // 对象
            name: "流量",//这个字段是展示图表上方的文字的
            data: [],
            waterLev: [],
            unit: "mm",
            color: { //设置颜色 以下是两个渐变
                type: 'linear',
                x: 0,
                y: 0,
                x2: 0,
                y2: 1,
                colorStops: [{
                    offset: 0,
                    color: 'rgba(0, 255, 158, 1)'
                }, {
                    offset: 1,
                    color: 'rgba(11, 70, 74, 0.29)'
                }],
                global: false
            }
        },
 ec: {
            onInit: initChart
        },
chartData: {},

• 初始化图表

var chart = null;
function initChart(canvas, width, height) {//初始化
    chart = echarts.init(canvas, null, {
        width: width,
        height: height
    });
    canvas.setChart(chart);
    chart.setOption(option);
    return chart;
};

• 定义option

  var option = {
      legend: {
          data: [],
          icon: 'roundRect',
          itemWidth: 10,
          itemHeight: 8,
          textStyle: {
              fontSize: 10,
          },
          top: 3,
          left: 'center',
          z: 100
      },
      grid: {
          right: '15%',
          top: '15%',
          containLabel: true,
      },
      tooltip: {
          trigger: 'axis',
          textStyle: {
              color: 'white',
          },
          formatter: function (params) {
              let str = '';
              let clipboardData = '';
              str += "水位：" + params[0].name + " m";
              params.forEach(function (item) {
                  str += "\n" + item.marker + " " + item.seriesName + " : " + item.value;
              });
              clipboardData = str.replace(/\{([^}]+)\}\s+/g, '');
              wx.setClipboardData({
                  data: clipboardData,
                  success: function () {
                      wx.hideToast({
                          success: (res) => {},
                      })
                  },
              })
              return str;
          },
          confine: true,
          backgroundColor: "rgba(0, 0, 0, 0.8)",
          position: function (point, params, dom, rect, size) {
              // 固定在顶部
              return [point[0], '20%'];
          }
      },
      dataZoom: [{
          show: false
      }],
      xAxis: {
          type: 'category',
          boundaryGap: false,
          data: [],
          axisLabel: {
              //坐标轴刻度标签的相关设置。
              interval: 0,
          },
          name: '水位:m'
      },
      yAxis: {
          x: 'center',
          type: 'value',
          splitLine: {
              lineStyle: {
                  type: 'dashed'
              }
          },
          name: 'm³/s'
      },
      series: [],
  };

• 定义方法掉接口数据定义option

 getZQR() {
        let code = this.data.stCode
        app.colorUISdk.request({
            url: '/dmp-micro-svc-base-manager/baseInfo/ZQRelationLines',
            method: "POST",
            data: {
                setCode: code,
                "pageNum": 0,
                "pageSize": 100
            },
            header: {
                'token': app.globalData.token,
            },
        }).then(res => {
            if (res.code == 200) {
                this.setPptn(res.obj[code]);//数据拿到调下一个方法
            }
        });
    }

• 定义方法接收

    setPptn(list) { //赋值给chartData
        let data = [];
        let waterLev = [];
        if (list) {
            list.forEach((item, index) => {
                data[index] = item.flow;//纵坐标的数据
                waterLev[index] = item.waterLev;//横坐标的数据
            });
            let pptn = this.data.pptn;
            pptn.data = data;
            pptn.waterLev = waterLev;
            this.setData({
                pptn: pptn,
                chartData: this.setEcData(pptn)//调用下面的方法
            });
        }
        this.setEcOption();
    }，
    setEcData() { //
        this.setData({
            chartData: {
                legendData: [],
                series: [],
                waterLev: []
            }
        });
        let chartData = {};
        if (arguments.length > 0) {
            let arr = [];
            let data = [];
            let date = arguments[0].waterLev;
            for (let i = 0; i < arguments.length; i++) {
                data.push(arguments[i].name)
                arr.push(this.setSeries(arguments[i]))
            }
            chartData.legendData = data;
            chartData.waterLev = date;
            chartData.series = arr;

        }
        return chartData;
    }，
    setSeries(param) { //设置
        return {
            name: param.name,
            color: param.color,
            type: 'line',
            areaStyle: {},
            symbol: 'circle',
            data: param.data,
            smooth: true,
        };
    }

• 最后一步 传入数据

      setEcOption() {
          option.xAxis.data = this.data.chartData.waterLev;
          option.legend.data = this.data.chartData.legendData;
          option.series = this.data.chartData.series;
          setTimeout(() => {
              chart.setOption(option);
          }, 1000)
      },

  

   结束 如果有不明白的地方 可以评论问我