<template> <v-chart ref="vChartRef" :option="option" autoresize></v-chart> </template> <script setup> import {ref, defineProps, watch} from 'vue' import VChart from 'vue-echarts' import * as echarts from 'echarts' const props = defineProps({ data: { type: Object } }) const option = ref() watch( () => props.data, () => { //解决警告 There is a chart instance already initialized on the dom. // VChart.dispose(document.getElementById('LineBar')) console.log(props.data); let xLabel = props.data.legend; let L1 =props.data.L1; let L0 = props.data.L0; initChart(xLabel,L1,L0) } ) const initChart=(xLabel,L1,L0)=>{ option.value={ tooltip: { trigger: 'item', }, legend: { data:xLabel }, grid: { top:'15%', left: '3%', right: '4%', bottom: '3%', containLabel: true }, xAxis: { type: 'category', boundaryGap: true, axisLine: { //坐标轴轴线相关设置。数学上的x轴 show: true, lineStyle: { color: '#233653' } }, axisLabel: { //坐标轴刻度标签的相关设置 textStyle: { color: 'rgba(51,51,51,.6)', padding: 5, fontSize: 12 } }, splitLine: { show: false, lineStyle: { color: '#192a44' } }, axisTick: { show: false }, data: xLabel }, yAxis: [ { type: 'value', name: '万元', splitLine: { show: false, lineStyle: { type: 'dashed' } }, axisLine: { show: false, lineStyle: { color: '#233653' } }, axisLabel: { show: true, textStyle: { color: 'rgba(51,51,51,.6)', padding: 10 } }, axisTick: { show: false } }, { type: 'value', name: '%', splitLine: { show: false, lineStyle: { type: 'dashed' } }, axisLine: { show: false, lineStyle: { color: '#233653' } }, axisLabel: { show: true, textStyle: { color: 'rgba(51,51,51,.6)', padding: 10 } }, axisTick: { show: false } } ], series: [ { name: '营业收入', type: 'line', symbolSize: 5, // 设置折线上圆点大小 symbol: 'circle', // 设置拐点为实心圆 yAxisIndex: 0, data: L1, itemStyle: { color: '#669AFF', }, }, { name: '入住率', type: 'line', symbolSize: 5, // 设置折线上圆点大小 symbol: 'circle', // 设置拐点为实心圆 yAxisIndex: 1, data:L0, itemStyle: { color: '#62D158', }, } ] } } </script> <style lang="scss" scoped></style>我想给两根折线添加图例，请问要怎么办

您可以在 option.value 中的 series 数组中分别为两根折线设置 name 属性，例如：

series: [
  {
    name: '营业收入',
    type: 'line',
    // ...
  },
  {
    name: '入住率',
    type: 'line',
    // ...
  }
]

然后，在 option.value 中添加 legend 属性，将 data 属性设置为两根折线的 name 属性组成的数组，例如：

legend: {
  data: ['营业收入', '入住率']
}

最后，将修改后的 option.value 赋值给组件的 option 属性即可：

<v-chart ref="vChartRef" :option="option" autoresize></v-chart>

完整的代码如下：

<template>
  <v-chart ref="vChartRef" :option="option" autoresize></v-chart>
</template>

<script setup>
import { ref, defineProps, watch } from 'vue'
import VChart from 'vue-echarts'
import * as echarts from 'echarts'

const props = defineProps({
  data: {
    type: Object
  }
})

const option = ref()

watch(
  () => props.data,
  () => {
    //解决警告 There is a chart instance already initialized on the dom.
    // VChart.dispose(document.getElementById('LineBar'))
    console.log(props.data)
    let xLabel = props.data.legend
    let L1 = props.data.L1
    let L0 = props.data.L0
    initChart(xLabel, L1, L0)
  }
)

const initChart = (xLabel, L1, L0) => {
  option.value = {
    tooltip: {
      trigger: 'item'
    },
    legend: {
      data: ['营业收入', '入住率']
    },
    grid: {
      top: '15%',
      left: '3%',
      right: '4%',
      bottom: '3%',
      containLabel: true
    },
    xAxis: {
      type: 'category',
      boundaryGap: true,
      axisLine: {
        //坐标轴轴线相关设置。数学上的x轴
        show: true,
        lineStyle: {
          color: '#233653'
        }
      },
      axisLabel: {
        //坐标轴刻度标签的相关设置
        textStyle: {
          color: 'rgba(51,51,51,.6)',
          padding: 5,
          fontSize: 12
        }
      },
      splitLine: {
        show: false,
        lineStyle: {
          color: '#192a44'
        }
      },
      axisTick: {
        show: false
      },
      data: xLabel
    },
    yAxis: [
      {
        type: 'value',
        name: '万元',
        splitLine: {
          show: false,
          lineStyle: {
            type: 'dashed'
          }
        },
        axisLine: {
          show: false,
          lineStyle: {
            color: '#233653'
          }
        },
        axisLabel: {
          show: true,
          textStyle: {
            color: 'rgba(51,51,51,.6)',
            padding: 10
          }
        },
        axisTick: {
          show: false
        }
      },
      {
        type: 'value',
        name: '%',
        splitLine: {
          show: false,
          lineStyle: {
            type: 'dashed'
          }
        },
        axisLine: {
          show: false,
          lineStyle: {
            color: '#233653'
          }
        },
        axisLabel: {
          show: true,
          textStyle: {
            color: 'rgba(51,51,51,.6)',
            padding: 10
          }
        },
        axisTick: {
          show: false
        }
      }
    ],
    series: [
      {
        name: '营业收入',
        type: 'line',
        symbolSize: 5, // 设置折线上圆点大小
        symbol: 'circle', // 设置拐点为实心圆
        yAxisIndex: 0,
        data: L1,
        itemStyle: {
          color: '#669AFF'
        }
      },
      {
        name: '入住率',
        type: 'line',
        symbolSize: 5, // 设置折线上圆点大小
        symbol: 'circle', // 设置拐点为实心圆
        yAxisIndex: 1,
        data: L0,
        itemStyle: {
          color: '#62D158'
        }
      }
    ]
  }
}
</script>

<style lang="scss" scoped></style>