echarts图表的自适应方法

在utils创建mixins文件夹在创建resize.js

import { debounce } from '../index.js'

export default {
  data() {
    return {
      $_sidebarElm: null,
      $_resizeHandler: null
    }
  },
  mounted() {
    this.$_resizeHandler = debounce(() => {
      if (this.chart) {
        this.chart.resize()
      }
    }, 100)
    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
    $_initResizeEvent() {
      window.addEventListener('resize', this.$_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)
    }
  }
}

然后在utils的index.js中编写debounce 方法

/**
 * @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
  }
}

使用的时候在图表组件中引入（一定要将图表封装成组件，不然无法重复使用）

import resize from '@/utils/mixins/resize'
export default {
  mixins: [resize],
}
 methods: {
    // 时段人次分布
    box3 () {
   // 注意这里一定要使用this.chart
      this.chart = this.$echarts.init(this.$refs.box3)
      let option = {}
   }
}