解决echarts vue数据更新,视图不更新问题(echarts嵌在vue弹框中)

1.问题描述：在echarts弹框中嵌入echarts，在页面数据改变时，echarts视图不更新；

2.解决办法：

数据更新时以为drawLine()函数在updated()里面执行（这种情况之前碰到过），后来发现热更新之后视图更新了，所以跟周期函数没有关系；参考了一下网上的一些资料，发现可以用vue中的watch()函数来监听数据的更新，一旦数据更新了，那么就在watch()函数中调用drawLine()函数，发现视图更新了，完美解决。

补充知识：vue echarts line动态刷新数据组件

我就废话不多说了，大家还是直接看代码吧~

<template>
 <div class="echartLine-wrap">
  <div class="echartLine-title">
   <img src="@/assets/icon.png" alt />
   <div class="text">
    <div>{{echartData.title}}</div>
    <div>{{echartData.title2}}</div>
    <div>{{echartData.title3}}</div>
   </div>
  </div>
  <div ref="lineDom" id="myChart"></div>
 </div>
</template>

<script>
export default {
 name: "echartLine",
 props: {
  echartData: {
   type: Object,
   default: () => {}
  }
 },
 data() {
  return {
   img: require("../assets/time_bj.png")
  };
 },
 mounted() {
  setTimeout(() => {
   this.ButtomDrawLine();
  }, 500);
 },
 created() {},
 methods: {
  ButtomDrawLine() {
   let t = this;
   let myChart = this.$echarts.init(this.$refs.lineDom);
   myChart.setOption({
    title: { text: "" },
    tooltip: {
     trigger: "axis",
     borderRadius: 8, //边框圆角
     backgroundColor: "rgba(51,204,204,0)", //背景颜色（此时为默认色）
     formatter: function(params) {
      let value = params[0].value;
      let name = params[0].name;
      let html = `
       <div class='line-html'>
        <span>
        <span class='active' style="background: ${t.echartData.itemStyle.color}"></span>
        ${value}
        </span>
        <span>${t.echartData.title3}</span>
        <span></span>
        <span>${name}</span>
       </div>
      `;
      return html;
     },
     textStyle: { color: "#ffff", align: "center", fontSize: 18 }
    },
    // legend: {
    //  left: 'right',
    //  textStyle: {//图例文字的样式
    //   color: '#ffffff',
    //   fontSize: 14
    //  },
    //  show: true,
    //  data: [
    //   {
    //    name: '审方数',
    //   },
    //   {
    //    name: '处方数',
    //   },
    //   {
    //    name: '会员数'
    //   },
    //   {
    //    name: '含麻登记',
    //   }
    //  ]
    // },
    /*toolbox: {
      feature: {
       dataView: {readOnly: false},
       restore: {},
       saveAsImage: {}
      },
      iconStyle:{
       normal:{
        color:'white',//设置颜色
       }
      }
     },*/
    xAxis: [
     {
      boundaryGap: true,
      type: "category",
      axisLine: {
       // x轴的颜色和宽度
       lineStyle: {
        color: "#0070C6"
       }
      },
      axisLabel: {
       show: true,
       textStyle: {
        color: "#fff"
       }
      },
      offset: 0,
      nameTextStyle: {
       align: "right"
      },
      axisTick: {
       alignWithLabel: true
      },
      data: t.echartData.XData
     }
    ],
    yAxis: [
     {
      type: "value",

      axisLabel: {
       show: true,
       textStyle: {
        color: "#fff"
       }
      },
      axisLine: {
       lineStyle: {
        color: "#0070C6"
       }
      },
      // 控制网格线是否显示
      splitLine: {
       show: false
      },
      min: 0,
      splitNumber: 5,
      boundaryGap: [0.2, 0.2],
      data: [0, 50, 100, 150]
     }
    ],
    grid: {
     top: "3.5%",
     left: "0",
     right: "0",
     bottom: "0",
     containLabel: true
    },
    series: [
     {
      name: t.echartData.title,
      type: "line",
      // smooth: true,

      showSymbol: true,
      symbolSize: 4, // 拐点图形大小
      cursor: "pointer",
      areaStyle: {
       normal: {
        color: new t.$echarts.graphic.LinearGradient(0, 0, 0, 1, [
         {
          offset: 0,
          color: t.echartData.areaStyleColor.fromColor
         },
         {
          offset: 0.4,
          color: t.echartData.areaStyleColor.toColor
         }
         // {
         //  offset: 1,
         //  color: "rgba(63,227,236,0.00)"
         // }
        ])
        // ['rgba(63,227,236,0.3)'],
       }
      },
      itemStyle: {
       color: [t.echartData.itemStyle.color]
      },
      data: t.echartData.YData,
      icon:
       "image://http://file.dyzhkj.cn/null/1562315548784PyZcsO处方数.png"
     }
     // {
     //  name: '处方数',
     //  type: 'line',
     //  smooth: true,
     //  symbolSize: 1,     // 拐点图形大小
     //  areaStyle: {
     //   color: new t.$echarts.graphic.LinearGradient(0, 0, 0, 1, [{
     //    offset: 0,
     //    color: 'rgba(82,206,86,0.8)'
     //   }, {
     //    offset: .4,
     //    color: 'rgba(82,206,86,0.3)'
     //   }, {
     //    offset: 1,
     //    color: 'rgba(82,206,86,0.00)'
     //   }])
     //   // ['rgba(82,206,86,0.3)'],
     //  },
     //  itemStyle: {
     //   normal: {
     //    color: ['#52CE56'],
     //   }
     //  },
     //  data: [10, 5, 15, 5, 15, 20, 15, 20, 15, 5, 15, 10]
     // },
     // {
     //  name: '会员数',
     //  type: 'line',
     //  smooth: true,
     //  symbolSize: 1,     // 拐点图形大小
     //  areaStyle: {
     //   color: new t.$echarts.graphic.LinearGradient(0, 0, 0, 1, [{
     //    offset: 0,
     //    color: 'rgba(251,98,100,0.8)'
     //   }, {
     //    offset: .4,
     //    color: 'rgba(251,98,100,0.3)'
     //   }, {
     //    offset: 1,
     //    color: 'rgba(251,98,100,0.00)'
     //   }])
     //   // ['rgba(251,98,100,0.3)'],
     //  },
     //  itemStyle: {
     //   normal: {
     //    color: ['#FB6264'],
     //   }
     //  },
     //  data: [35, 45, 65, 25, 65, 44, 15, 40, 35, 46, 50, 25]
     // },
     // {
     //  name: '含麻登记',
     //  type: 'bar',
     //  itemStyle: {
     //   normal: {
     //    color: new t.$echarts.graphic.LinearGradient(0, 0, 0, 1, [{
     //     offset: 0,
     //     color: 'rgba(231,233,65,0.8)'
     //    }, {
     //     offset: .4,
     //     color: 'rgba(231,233,65,0.3)'
     //    }, {
     //     offset: 1,
     //     color: 'rgba(231,233,65,0.00)'
     //    }]),
     //    // ['rgba(231,233,65,0.5)'],
     //    barBorderColor: '#E7E941',      // 柱条边线
     //    barBorderRadius: 0,        // 柱条边线圆角，单位px，默认为0
     //    barBorderWidth: 1,           // 柱条边线线宽，单位px，默认为1
     //   }
     //  },
     //  barWidth: 15,//柱图宽度
     //  data: [5, 7, 3, 7, 5, 4, 5, 6, 4, 7, 5, 8]
     // }
    ]
   });
  }
 }
};
</script>

<style lang="less">
.line-html {
 width: 83.5px;
 height: 38px;
 text-align: center;
 background: url("../assets/line_btn_bj.png") no-repeat;
 background-size: 83.5px 38px;
 line-height: 42px;
 box-sizing: border-box;
 position: relative;
 font-size: 9px;
 padding-right: 2px;
 box-sizing: border-box;

 .active {
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: #fff;
  display: inline-block;
  margin-left: 3px;
  margin-bottom: 1.5px;
  box-sizing: border-box;
 }
 > span:nth-child(3) {
  background: url("../assets/time_bj.png") no-repeat;
  background-size: 38.5px 14px;
  position: absolute;
  top: -5px;
  left: 23px;
  right: 0;
  bottom: 0;

  box-sizing: border-box;
 }
 > span:nth-child(4) {
  position: absolute;
  top: -19px;
  left: 2px;
  right: 2px;
  bottom: 0;
  font-size: 8px;

   box-sizing: border-box;
 }
}
</style>
<style scoped lang="less">
.echartLine-wrap {
 width: 100%;
 height: 100%;
 .echartLine-title {
  width: 100%;
  color: #fff;
  display: flex;
  flex-direction: row;
  justify-content: start;
  align-items: center;
  padding-bottom: 13px;

  > img {
   width: 7.5px;
   height: 14px;
   margin-right: 8.5px;

   box-sizing: border-box;
  }
  > .text {
   text-align: left;
   display: flex;
   flex-direction: row;
   justify-content: start;
   font-size: 12px;
   line-height: 1;
   align-items: baseline;

   > div:nth-child(2) {
    font-size: 15px;
    margin: 0 5px 0 10px;
    font-weight: bold;

    box-sizing: border-box;
   }
  }
 }
 #myChart {
  width: 100%;
  height: 165px;
 }
}
</style>

调用

//html
 <echartLine :echartData="echartData" ref="echartData1" />

//index.js
 echartData: {
    title: "溶氧",
    title2: 3,
    title3: "毫克/升",
    XData: [1,2,3,4,5,6,7,8,9],
    YData: [12,34,56,66,65,77,12,11,33,44],

    areaStyleColor: {
     fromColor: "#1AB8F9",
     toColor: "rgba(63,227,236,0.1)"
    },
    itemStyle: {
     color: "#1AB8F9"
    }
   }

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