需求：显示默认时间为当前时间至7天之前时间 去请求数据

实现效果：

1.安装Echarts

cnpm install echarts -S

2.在vue项目中使用Echarts

父组件使用子组件的代码
template区的使用

     <BarChart
        :labelList="chartData.labelList"
        :checkOutValueList="chartData.checkOutValueList"
        :putInValueList="chartData.putInValueList"
      />

数据 （引入组件，注册组件，定义图表需要的数据）

 data() {
    return {
     chartData: {}, //echart图表数据
    };
  },

接口返回数据

  created() {
    this.getList();
  },
  methods: {
    getList() {
      let data = {
        updateDate: this.deviceFormData.time,
        pn: this.pn,
      };
      getInOutData(data).then((res) => {
        this.chartData = res;
        console.log(this.chartData, "子组件this.chartData");
      });
    },
  }

数据结构：

子组件页面代码（接收数据，并渲染）

<template>
  <div
    :class="className"
    :style="{ height: height, width: width }"
    id="myChart"
  />
</template>

<script>
import echarts from "echarts";
export default {
  props: {
    //接受父组件传递来的数据
    labelList: Array,
    checkOutValueList: Array,
    putInValueList: Array,
    className: {
      type: String,
      default: "chart",
    },
    width: {
      type: String,
      default: "100%",
    },
    height: {
      type: String,
      default: "300px",
    },
  },
  data() {
    return {};
  },
  watch: {
    labelList: function (newQuestion, oldQuestion) {
      this.initChart();
    },
  },
  mounted() {
    this.initChart();
  },
  methods: {
    initChart() {
      // 创建 echarts 实例。
      var myChartOne = echarts.init(document.getElementById("myChart"));
      myChartOne.setOption({
        tooltip: {
          trigger: "axis",
          axisPointer: {
            type: "shadow",
          },
        },
        legend: {
          textStyle: {
            color: "#ffffff",
          },
        },
        grid: {
          left: "3%",
          right: "4%",
          bottom: "3%",
          containLabel: true,
        },
        xAxis: [
          {
            type: "category",
            data: this.labelList,
            axisTick: {
              alignWithLabel: true,
            },
            axisLabel: {
              textStyle: {
                color: "#fff", //坐标值得具体的颜色
              },
            },
          },
        ],
        yAxis: [
          {
            type: "value",
            axisLabel: {
              textStyle: {
                color: "#fff", //坐标值得具体的颜色
              },
            },
          },
        ],
        series: [
          {
            name: window.vm.$i18n.t("barChart.putQuantity"),
            type: "bar",
            data: this.checkOutValueList,
            itemStyle: {
              color: "#9B59B6",
            },
          },
          {
            name: window.vm.$i18n.t("barChart.outQuantity"),
            type: "bar",
            data: this.putInValueList,
            itemStyle: {
              color: "#DFBA49",
            },
          },
        ],
      });
    },
  },
};
</script>