开发中用到了echart图表，需要图表自适应大小resize,一开始使用的方法是：

window.onresize = function () {
       this.myChart.resize();
};

但是又遇到一个问题，点击侧边栏的展开收起的时候，图表的大小没有自适应（因为窗口的大小没有变化）
这里参考vue+element+admin的框架写的自适应

一、index.vue的文件
引入chart图表``

这里是数据

chartData: {
        title: {
          text: '3-1(2)',
          textStyle: {
            color: '#979797',
            fontSize: 14
          }
        },
        tooltip: {
          trigger: 'axis'
        },
        legend: {
          icon: 'rect',
          itemWidth: 4, // 图例标记的图形宽度
          itemHeight: 11,
          textStyle: {
            lineHeight: 65,
            fontSize: 14
          },
          data: ['邮件营销', '联盟广告', '视频广告', '直接访问', '搜索引擎']
        },
        grid: {
          left: '3%',
          right: '4%',
          bottom: '3%',
          containLabel: true
        },
        xAxis: {
          type: 'category',
          boundaryGap: false,
          data: ['周一', '周二', '周三', '周四', '周五', '周六', '周日']
        },
        yAxis: {
          type: 'value'
        },
        series: [
          {
            name: '邮件营销',
            type: 'line',
            stack: '总量',
            data: [0, 132, 101, 134, 90, 230, 210]
          },
          {
            name: '联盟广告',
            type: 'line',
            stack: '总量',
            data: [220, 12, 191, 234, 20, 330, 10]
          },
          {
            name: '视频广告',
            type: 'line',
            stack: '总量',
            data: [15, 232, 201, 154, 190, 330, 110]
          },
          {
            name: '直接访问',
            type: 'line',
            stack: '总量',
            data: [320, 420, 301, 334, 60, 330, 320]
          },
          {
            name: '搜索引擎',
            type: 'line',
            stack: '总量',
            data: [820, 932, 901, 934, 1290, 1330, 1320]
          }
        ]
 }

二、chart.vue

<template>
  <div :class="className" :style="{height:height,width:width}" />
</template>

<script>
import echarts from 'echarts'
import resize from './mixins/resize'

export default {
  mixins: [resize],
  props: {
    className: {
      type: String,
      default: 'chart'
    },
    width: {
      type: String,
      default: '100%'
    },
    height: {
      type: String,
      default: '300px'
    },
    autoResize: {
      type: Boolean,
      default: true
    },
    chartData: {
      type: Object,
      required: true
    }
  },
  data() {
    return {
      chart: null
    }
  },
  watch: {
    chartData: {
      deep: true,
      handler(val) {
        this.setOptions(val)
      }
    }
  },
  mounted() {
    this.$nextTick(() => {
      this.initChart()
    })
  },
  beforeDestroy() {
    if (!this.chart) {
      return
    }
    this.chart.dispose()
    this.chart = null
  },
  methods: {
    initChart() {
      this.chart = echarts.init(this.$el, 'macarons')
      this.setOptions(this.chartData)
    },
    setOptions(chartData) {
      this.chart.setOption(chartData)
    }
  }
}
</script>

三、resize.js

import { debounce } from './debounce'

export default {
  data() {
    return {
      $_sidebarElm: null
    }
  },
  mounted() {
    this.$_initResizeEvent()
    this.$_initSidebarResizeEvent()
  },
  beforeDestroy() {
    this.$_destroyResizeEvent()
    this.$_destroySidebarResizeEvent()
  },
  // to fixed bug when cached by keep-alive
  // https://github.com/PanJiaChen/vue-element-admin/issues/2116
  activated() {
    this.$_initResizeEvent()
    this.$_initSidebarResizeEvent()
  },
  deactivated() {
    this.$_destroyResizeEvent()
    this.$_destroySidebarResizeEvent()
  },
  methods: {
    // use $_ for mixins properties
    // https://vuejs.org/v2/style-guide/index.html#Private-property-names-essential
    $_resizeHandler() {
      return debounce(() => {
        if (this.chart) {
          this.chart.resize()
        }
      }, 100)()
    },
    $_initResizeEvent() {
      window.addEventListener('resize', this.$_resizeHandler)
    },
    $_destroyResizeEvent() {
      window.removeEventListener('resize', this.$_resizeHandler)
    },
    $_sidebarResizeHandler(e) {
      if (e.propertyName === 'width') {
        this.$_resizeHandler()
      }
    },
    $_initSidebarResizeEvent() {
      this.$_sidebarElm = document.getElementsByClassName('sidebar-container')[0]
      this.$_sidebarElm && this.$_sidebarElm.addEventListener('transitionend', this.$_sidebarResizeHandler)
    },
    $_destroySidebarResizeEvent() {
      this.$_sidebarElm && this.$_sidebarElm.removeEventListener('transitionend', this.$_sidebarResizeHandler)
    }
  }
}

四、debounce.js

/**
 * @param {Function} func
 * @param {number} wait
 * @param {boolean} immediate
 * @return {*}
 */
export function debounce(func, wait, immediate) {
  let timeout, args, context, timestamp, result

  const later = function() {
    // 据上一次触发时间间隔
    const last = +new Date() - timestamp

    // 上次被包装函数被调用时间间隔 last 小于设定时间间隔 wait
    if (last < wait && last > 0) {
      timeout = setTimeout(later, wait - last)
    } else {
      timeout = null
      // 如果设定为immediate===true，因为开始边界已经调用过了此处无需调用
      if (!immediate) {
        result = func.apply(context, args)
        if (!timeout) context = args = null
      }
    }
  }

  return function(...args) {
    context = this
    timestamp = +new Date()
    const callNow = immediate && !timeout
    // 如果延时不存在，重新设定延时
    if (!timeout) timeout = setTimeout(later, wait)
    if (callNow) {
      result = func.apply(context, args)
      context = args = null
    }

    return result
  }
}