1.把echarts 在 `methods` 封装成一个方法`mounted` 在中调用

折线图和柱状图

mounted调用下边两个方法

  mounted(){//最早获取DOM元素的生命周期函数 挂载完毕
    console.log('mounted-id' , document.getElementById('charts'))
      this.line()
      this.pie()
    },

methods里边的方法

line() {
      // 基于准备好的dom，初始化echarts实例
      var myChart = echarts.init(document.getElementById('charts'));
      // 绘制图表
      myChart.setOption({
        tooltip: {//提示框组件
          trigger: 'axis',
        },
        legend: {},
        toolbox: {
          feature: {
            // dataZoom: {
            //   yAxisIndex: 'none'
            // },
            // restore: {},
            saveAsImage: {}
          }
        },
        xAxis: {//x轴数据
         data: [120, 200, 150, 80, 70, 110, 130],
        },
        yAxis: {//y轴会自动创建数据
        },
        series: [//图表内容
          {
            name: '销售额',
            type: 'line',
            data: [120, 200, 150, 80, 70, 110, 130],,
            smooth: true,//是否平滑曲线显示
          },
          {
            name: '销售量',
            type: 'bar',
             data: [120, 200, 150, 80, 70, 110, 130],
          }

        ]
      });
    },

饼图

 pie(){
       let myChart = echarts.init(document.getElementById('pie'));
        myChart.setOption({
        tooltip: {
          trigger: 'item'
        },
        legend: {
          top: '5%',
          left: 'center'
        },
        series: [
          {
            name: 'Access From',
            type: 'pie',
            radius: ['40%', '70%'],
            avoidLabelOverlap: false,
            itemStyle: {
              borderRadius: 10,
              borderColor: '#fff',
              borderWidth: 2
            },
            label: {
              show: false,
              position: 'center'
            },
            emphasis: {
              label: {
                show: true,
                fontSize: 40,
                fontWeight: 'bold'
              }
            },
            labelLine: {
              show: false
            },
            data: [
              { value: 1048, name: 'Search Engine' },
              { value: 735, name: 'Direct' },
              { value: 580, name: 'Email' },
              { value: 484, name: 'Union Ads' },
              { value: 300, name: 'Video Ads' }
            ]
          }
        ]
      });
    },

注意的地方:created调用location事件时获取dom对象，是不行的，因为在created钩子函数中是获取不到dom的，我们可以使用mounted钩子替换成created钩子

从后端取数据

发现后端给我们返回的不是echarts的格式，这个时候我们做一个操作
在这里插入图片描述
下一步操作遍历内容数据格式转换

最后一步在echarts柱状图或者折线图里边去显示这些数据

    methods:{
        // -----获取图标动态数据
        async format(){
          let res = await this.$api.format()
          console.log('获取图标动态数据---',res.data);
          console.log(res.data.result.data.sale_money);//[{}{}]
          // 折线图 柱状图数据格式:[xx,xx,xx]
          // 获取x轴的数据名称
          let arr = res.data.result.data.sale_money;//拿到数据
          let arrx = []
          let total = []
          let money = []
          arr.forEach((ele)=>{//ele是取每一项
             arrx.push(ele.name)
             total.push(ele.num)
             money.push(ele.total_amount)
          })
             console.log(arrx);
             console.log(total);
             console.log(money);
             this.line(arrx,money,total)
        },
         //绘制图表--折线------------------
      line(arrx,money,total) {
        // 基于准备好的dom，初始化echarts实例
        var myChart = echarts.init(document.getElementById('charts'));
        // 绘制图表
        myChart.setOption({
          tooltip: {//提示框组件
            trigger: 'axis',
          },
          legend: {},
          toolbox: {
            feature: {
              // dataZoom: {
              //   yAxisIndex: 'none'
              // },
              // restore: {},
              saveAsImage: {}
            }
          },
          xAxis: {//x轴数据
            data:arrx,
          },
          yAxis: {//y轴会自动创建数据
          },
          series: [//图表内容
            {
              name: '销售额',
              type: 'line',
              data:money,
              smooth: true,//是否平滑曲线显示
            },
            {
              name: '销售量',
              type: 'bar',
              data: total,
            }

          ]
        });
      },
      },

饼状图取数据发现

在这里插入图片描述
数据循环遍历+数据格式转换

    let pieData = []
          arr.forEach((ele)=>{//ele是取每一项
            //饼图--对象数据
            let obj={}
            obj.name = ele.name;
            obj.value = ele.total_amount;
            pieData.push(obj)//[{name:,value:},{},{}]
          })
             console.log('饼图',pieData);

饼图最后一步在echarts柱状图或者折线图里边去显示这些数据

   //绘制饼图
    pie(pieData) {
      var myChart = echarts.init(document.getElementById('pie'));
      var option;
      option = {
        tooltip: {
          trigger: 'item',
          formatter:'{a}<br/>{b}:{d}%'
        },
        legend: {
          orient: 'vertical',
          left: 'left'
        },
        series: [
          {
            name: '产品销售额',
            type: 'pie',
            radius: '50%',
            data:pieData,
            // data: [//[{},{}]
            //   { value: 1048, name: '审议' },
            //   { value: 735, name: '淘宝' },
            //   { value: 580, name: '京东' }
            // ],
            emphasis: {//高亮配置
              itemStyle: {
                shadowBlur: 10,
                shadowOffsetX: 0,
                shadowColor: 'rgba(0, 0, 0, 0.5)'
              }
            }
          }
        ]
      };

      option && myChart.setOption(option);
    },

在这里插入图片描述
全部代码

<template>
  <div class="home">
    <!--1.  顶部区域布局---------- -->
    <div class="header">
      <div class="item">
        总销售额
        <div class='num'>{{ totalData.saleTotal | num}}</div>
        <div class="bottom">今日销售额:{{totalData.sale | num}}</div>
      </div>
      <div class="item">总访问量
        <div class='num'>{{ totalData.viewsTotal | num}}</div>
         <div class="bottom">今日访问量:{{totalData.views | num}}</div>
      </div>
      <div class="item">总收藏量
        <div class='num'>{{ totalData.collectTotal | num  }}</div>
         <div class="bottom">今日销售额:{{ totalData.collectTotal | num}}</div>
      </div>
      <div class="item">总支付量
        <div class='num'>{{totalData.payTotal | num }}</div>
         <div class="bottom">今日支付量:{{ totalData.pay | num}}</div>
      </div>
    </div>

      <!--2. 访问数据统计 ----------------->
      <div class="content">
      <div class="time-info" id='box13'>
        <div class="title">月销售额</div>
        <div id="charts" style="width: 100%; height: 300px"></div>
      </div>
      <div class="area" id="box1">
         <div class="title">产品销售比例</div>
        <div id="pie" style="width: 100%; height: 300px"></div>
      </div>
    </div>


    <!-- 3.  -->
     <!-- 最新内容 -->
     <div class="home-footer">
      <el-card class="box-card">
        <div slot="header" class="clearfix">
          <span>今日订单</span>
        </div>
        <div class="text item">
          <el-row>
            <el-col :span="8">
             <div class="title">今日订单数</div>
              <div>{{ orderData.curOrderCount }}</div>
            </el-col>
            <el-col :span="8">
              <div class="title">汇总确认订单</div>
             <div>{{ orderData.curCollect }}</div>
            </el-col>
            <el-col :span="8">
              <div class="title">今日金额</div>
             <div>{{ orderData.curMoney }}</div>
            </el-col>
          </el-row>
        </div>
      </el-card>
      <el-card class="box-card">
        <div slot="header" class="clearfix">
          <span>本月订单</span>
        </div>
        <div class="text item">
          <el-row>
            <el-col :span="8">
             <div class="title">本月订单数</div>
              <div>{{ orderData.orderCount }}</div>
            </el-col>
            <el-col :span="8">
              <div class="title">汇总确认订单</div>
             <div>{{ orderData.collect }}</div>
            </el-col>
            <el-col :span="8">
              <div class="title">本月金额</div>
             <div>{{ orderData.money }}</div>
            </el-col>
          </el-row>
        </div>
      </el-card>
      <el-card class="box-card">
        <div slot="header" class="clearfix">
          <span>快捷入口</span>
        </div>
        <div class="text item">
          <el-button type="primary">产品管理</el-button>
          <el-button>消息管理</el-button>
          <el-button>内容管理</el-button>
        </div>
      </el-card>
    </div>

  </div>
</template>

<script>
import * as echarts from 'echarts'; 
export default {
     data(){
        return{
            totalData:{},//数据统计
            orderData:{},//订单数据
        }
    },
    created(){
        this.totalInfo();//打开页面就要加载
        this.orderinfo();//
        this.format();
    },
    mounted(){//最早获取DOM元素的生命周期函数 挂载完毕
    console.log('mounted-id' , document.getElementById('charts'))
      // this.line()
      // this.pie()
    },
    methods:{
      // ------获取首页统计数据
        async totalInfo(){
            let res = await this.$api.totalInfo();
            console.log('首页统计信息---',res.data);
            this.totalData = res.data.data.list;
            // console.log( res.data.data.list);
        },
         // ----获取今日订单数据
        async orderinfo(){
          let res = await this.$api.orderinfo()
          console.log('首页统计信息---',res.data);
          this.orderData = res.data.list
        },
        // -----获取图标动态数据
        async format(){
          let res = await this.$api.format()
          console.log('获取图标动态数据---',res.data);
          console.log(res.data.result.data.sale_money);//[{}{}]
          // 折线图 柱状图数据格式:[xx,xx,xx]
          // 获取x轴的数据名称
          let arr = res.data.result.data.sale_money;//拿到数据
          let arrx = []
          let total = []
          let money = []
          let pieData = []
          arr.forEach((ele)=>{//ele是取每一项
            arrx.push(ele.name)
            total.push(ele.num)
            money.push(ele.total_amount)
            //饼图--对象数据
            let obj={}
          
            obj.name = ele.name;
            obj.value = ele.total_amount;
            pieData.push(obj)//[{name:,value:},{},{}]
          })
             console.log(arrx);
             console.log(total);
             console.log(money);
             this.line(arrx,money,total)
             this.pie(pieData)
             console.log('饼图',pieData);
        },
         //绘制图表--折线------------------
      line(arrx,money,total) {
        // 基于准备好的dom，初始化echarts实例
        var myChart = echarts.init(document.getElementById('charts'));
        // 绘制图表
        myChart.setOption({
          tooltip: {//提示框组件
            trigger: 'axis',
          },
          legend: {},
          toolbox: {
            feature: {
              // dataZoom: {
              //   yAxisIndex: 'none'
              // },
              // restore: {},
              saveAsImage: {}
            }
          },
          xAxis: {//x轴数据
            data:arrx,
          },
          yAxis: {//y轴会自动创建数据
          },
          series: [//图表内容
            {
              name: '销售额',
              type: 'line',
              data:money,
              smooth: true,//是否平滑曲线显示
            },
            {
              name: '销售量',
              type: 'bar',
              data: total,
            }

          ]
        });
      },
       //绘制饼图
    pie(pieData) {
      var myChart = echarts.init(document.getElementById('pie'));
      var option;
      option = {
        tooltip: {
          trigger: 'item',
          formatter:'{a}<br/>{b}:{d}%'
        },
        legend: {
          orient: 'vertical',
          left: 'left'
        },
        series: [
          {
            name: '产品销售额',
            type: 'pie',
            radius: '50%',
            data:pieData,
            // data: [//[{},{}]
            //   { value: 1048, name: '审议' },
            //   { value: 735, name: '淘宝' },
            //   { value: 580, name: '京东' }
            // ],
            emphasis: {//高亮配置
              itemStyle: {
                shadowBlur: 10,
                shadowOffsetX: 0,
                shadowColor: 'rgba(0, 0, 0, 0.5)'
              }
            }
          }
        ]
      };

      option && myChart.setOption(option);
    },
    },
    // 使用过滤器----处理数据格式
    filters:{
      num(value){
        if(!value) return;
        return value.toLocaleString();
      }
    }

}
</script>

<style lang="less" scoped>
.home {
  margin: 10px;
}
.header {
  display: flex;
  padding-right: 30px;
  .item {
    flex: 1;
    height: 100px;
    padding: 10px;
    background: #fff;
    border-radius: 10px;
    margin-left: 20px;
    margin-right: 20px;
    font-weight: bold;
    color: #fff;
    // text-align: center;
    position: relative;
    .num {
      font-size: 22px;
      margin: 10px;
      color: #fff;
    }
    .bottom {
      position: absolute;
      border-top: 1px solid rgb(246, 245, 245);
      padding: 10px 20px;
      bottom: 0;
      right: 0;
      left: 0;
      color: #fff;
      font-weight: normal;
    }
  }
  .item:nth-child(1) {
    background-image: linear-gradient(#df887d, #88554d);
  }
  .item:nth-child(2) {
    background-image: linear-gradient(#409eff, #2e556e);
  }
  .item:nth-child(3) {
    background-image: linear-gradient(#b54fa8, #713c7a);
  }
  .item:nth-child(4) {
    background-image: linear-gradient(#1cd2f1, #39717a);
  }
}
/deep/.el-card__body{
  // border: 1px solid red;
  text-align: center;
  line-height: 30px;
}
// 图表

.content {
  margin: 20px;
  display: flex;
  height: 320px;
  .time-info {
    flex: 2;
    background: #fff;
    margin-right: 20px;
    padding: 10px;
  }
  .area {
    flex: 1;
    background: #fff;
    padding: 10px;
  }
}

//内容

.home-footer {
  display: flex;
  padding-left: 20px;
  margin-bottom: 20px;
  .box-card {
    flex: 1;
    margin-right: 30px;
    span {
      font-weight: 600;
    }
  }
}

</style>