问题：没有报错但是图表不出来

【 调试了半天圆环图表没有不出来。是因为没有明示设置宽度与高度】

/* 请根据实际需求修改父元素尺寸，组件自动识别宽高 */
.charts-box {
  width: 100%;
  height: 300px;
}

最终效果

先导入ucharts到项目

uniapp的项目导入参考： uniapp 导入ucharts图表插件 H5项目， 使用echarts eopts配置-CSDN博客 

导入之后创建下面的ringEchart.vue

源码： 

<template>
  <view className="charts-box">
    <u-gap height="30" bg-color="#bfc"></u-gap>
    <view class="charts-box">
      <!-- 演示动态改变eopts -->
      <qiun-data-charts type="ring" :opts="{legend:{position:'bottom'}}" :eopts="ringOpts" :chartData="chartsDataPie2"
                        :echartsH5="true" :echartsApp="true"/>
    </view>

    <u-gap height="30" bg-color="#bfc"></u-gap>
    <view class="charts-box">
      <qiun-data-charts type="ring" :chartData="Ring2" :echartsH5="true" :echartsApp="true"
                        background="none" :eopts="eopts2"/>
    </view>

    <u-button @click="resetData">TEST</u-button>
  </view>
</template>

<script>
import UGap from "@/uview-ui/components/u-gap/u-gap.vue";
import UButton from "@/uview-ui/components/u-button/u-button.vue";

export default {
  components: {UButton, UGap},
  data() {
    return {
      ringOpts: {
        color: ['#FF00FF', '#AAFF11'],
        legend: {show: false}
      },
      chartsDataPie2: {},
      eopts2: {
        tooltip: {
          trigger: 'item'
        },
        extra: {
          pie: {
            offsetAngle: -45,
            ringWidth: 100,
            labelWidth: 15
          }
        },
        legend: {
          top: '5%',
          left: 'center'
        }
      },
      Ring2: {
        series: [
          {
            name: 'Access From',
            // type: 'pie',
            radius: ['40%', '70%'],
            avoidLabelOverlap: false,
            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'}
            ]
          }
        ]
      },
    };
  },
  onLoad() {
    console.log('|--onLoad')
  },
  onReady() {
    setTimeout(() => {
      //1. 获取数据
      this.getServerData();
    }, 1000);

  },
  mounted() {
    console.log('|--mounted')
    this.getServerData();
  },
  methods: {
    resetData() {
      this.Ring2 = {
        series: [
          {
            name: 'Access From',
            // type: 'pie',
            radius: ['40%', '70%'],
            avoidLabelOverlap: false,
            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'}
            ]
          }
        ]
      }
      this.eopts2.series = this.Ring2
      console.log(this.Ring2)
    },
    getServerData() {
      //模拟从服务器获取数据时的延时
      let PieA = {
        "series": [{
          "data": [
            {
              "name": "一班",
              "value": 50
            }, {
              "name": "二班",
              "value": 30
            }, {
              "name": "三班",
              "value": 20
            }, {
              "name": "四班",
              "value": 18
            }, {
              "name": "五班",
              "value": 8
            }
          ]
        }]
      }
      // this.chartsDataPie2 = JSON.parse(JSON.stringify(PieA))
      this.chartsDataPie2 = {  "series": [{
          "data": [
            {
              "name": "一班",
              "value": 50
            }, {
              "name": "二班",
              "value": 30
            }, {
              "name": "三班",
              "value": 20
            }, {
              "name": "四班",
              "value": 18
            }, {
              "name": "五班",
              "value": 8
            }
          ]
        }]}

   
    },
  }
};
</script>

<style scoped>
/* 请根据实际需求修改父元素尺寸，组件自动识别宽高 */
.charts-box {
  width: 100%;
  height: 300px;
}
</style>