vue3使用Echarts柱状图，封装组件，动态渐变柱状颜色

很久没有水文了，今天来水一篇，方便自己往后更好的划水！

第一步：安装echarts

npm i echarts

第二步：在main.js引入echarts

import * as echarts from 'echarts'

app.config.globalProperties.$echarts = echarts

或者可以在组件页面引入直接使用

第三步：封装组件：barChart.vue

<template>
  <div
    ref="EcharRef"
    :id="`EcharRef-${id}`"
    style="width: 100%; height: 100%"
  ></div>
</template>

<script>
import * as echarts from 'echarts'
import {fontSize} from '../fontSize.js'
import {onMounted} from 'vue'
export default {
  props: {
    chartData: Array,
    series: Array,
    id: String,
    color: Array,
    top: String
  },
  setup(props, context) {
    onMounted(() => {
      const color = props.color
      const data = props.series
      let newStyle = [] //生成渐变数组
      if (data.length > 0) {
        data.forEach((e, i) => {
          let style = [
            {offset: 0, color: color[i][0]}, // 0%柱图渐变色
            {offset: 1, color: color[i][1]} // 100%柱图渐变色
          ]
          newStyle.push(style)
        })
      }
      const series = []
      data.forEach((e, i) => {
        e['type'] = 'bar'
        let itemStyle = {
          color: new echarts.graphic.LinearGradient(0, 0, 1, 0, newStyle[i])
        }
        series.push({...e, ...itemStyle})
      })
      //需要获取到element,所以是onMounted的Hook
      let myChart = echarts.init(
        document.getElementById(`EcharRef-${props.id}`)
      )
      // 绘制图表
      const option = {
        tooltip: {
          trigger: 'axis',
          axisPointer: {
            type: 'shadow'
          },
          backgroundColor: 'rgba(0,12,13,.5)', // 修改背景颜色
          borderColor: '#70F1FF', // 修改边框颜色
          textStyle: {
            color: '#fff'
          }
        },
        legend: {
          data: []
        },
        color: ['#6CEAF9', '#2240E8', '#FBBACB', '#4695D1'],
        grid: {
          top: props.top || '12%',
          left: '1%',
          right: '6%',
          bottom: '5%',
          containLabel: true
        },
        xAxis: {
          type: 'value',
          boundaryGap: [0, 0.01],
          splitLine: {
            show: false
          },
          axisLabel: {
            show: true,
            color: '#ffffff',
            fontSize: fontSize(8)
          }
        },
        yAxis: {
          type: 'category',
          data: props.chartData || [],
          splitLine: {
            show: false
          },
          axisLabel: {
            show: true,
            color: '#ffffff',
            fontSize: fontSize(10)
          },
          axisTick: {
            show: false
          }
        },
        series: series
      }
      myChart.setOption(option)
      myChart.on('click', function (params) {
        context.emit('parentMethod', params)
      })
      window.onresize = function () {
        //自适应大小
        myChart.resize()
      }
    })
  }
}
</script>

<style>
</style>

font-size.js  主要是为了根据屏幕设置字体大小

export function fontSize(res) {
    let clientWidth = document.documentElement.clientWidth
    if (!clientWidth) return
    let fontSize = (clientWidth / 1280)
    return res * fontSize
}
export const defaultColor = ['#c23531', '#2f4554', '#61a0a8', '#d48265', '#91c7ae', '#749f83', '#ca8622', '#bda29a']
export const group = (array = [], subGroupLength = 0) => {
    let index = 0;
    const newArray = [];
    while (index < array.length) {
        newArray.push(array.slice(index, index += subGroupLength));
    }
    return newArray;
}

第四步：如何使用：application.vue

<template>
  <div class="application">
    <mytitle :title="'应用排行'"></mytitle>
    <div class="charts-box">
      <bar-chart
        :chartData="chartData"
        :series="series"
        :color="color"
        :id="'application'"
        @parentMethod="parentMethod"
      ></bar-chart>
    </div>
  </div>
</template>

<script setup>
import barChart from '@/components/echarts/barChart.vue'
import mytitle from './title.vue'
const chartData = ['Brazil', 'Indonesia', 'USA', 'India', 'China']
const color = [
  ['#0095FF', '#008FF9'],
  ['#65D8DF', '#2BDABB']
]
const series = [
  {
    name: '2011',
    data: [120, 248, 204, 490, 174]
  },
  {
    name: '2012',
    data: [325, 438, 100, 594, 131]
  }
]
const parentMethod = (data) => {
  console.log('data', data)
}

</script>

<style lang="less" scoped>
.application {
  height: 100%;
  width: 100%;
  .charts-box {
    height: calc(100% - 35px);
  }
}
</style>

最后看看效果图