vue中使用echarts图表自适应窗口的几种方案

1.使用window.onresize

let myChart = this.$echarts.init(document.getElementById(id))
window.onresize = function () {
      myChat.resize()
}

缺点：多个echarts的时候就只有最后一个生效了，onresize会被覆盖

2.使用window.addEventListener添加resize方法

let myChart = this.$echarts.init(document.getElementById(dom))
let listener= function () {
      myChat.resize()
}
window.addEventListener('resize', listener)

缺点：当vue页面路由跳转到下一个页面时，上一个页面的onresize方法会继续执行

3.实现在div使用onresize方法

实现原理：在div上实现类似window的onresize 监听，这样既能实现图表的自适应，也不会因为页面跳转之后继续执行三个页面的onresize 方法

实现方法：

1. 在assets 创建 esresize.js

   var EleResize = {
     _handleResize: function (e) {
       var ele = e.target || e.srcElement
       var trigger = ele.__resizeTrigger__
       if (trigger) {
         var handlers = trigger.__z_resizeListeners
         if (handlers) {
           var size = handlers.length
           for (var i = 0; i < size; i++) {
             var h = handlers[i]
             var handler = h.handler
             var context = h.context
             handler.apply(context, [e])
           }
         }
       }
     },
     _removeHandler: function (ele, handler, context) {
       var handlers = ele.__z_resizeListeners
       if (handlers) {
         var size = handlers.length
         for (var i = 0; i < size; i++) {
           var h = handlers[i]
           if (h.handler === handler && h.context === context) {
             handlers.splice(i, 1)
             return
           }
         }
       }
     },
     _createResizeTrigger: function (ele) {
       var obj = document.createElement('object')
       obj.setAttribute('style',
         'display: block; position: absolute; top: 0; left: 0; height: 100%;  100%; overflow: hidden;opacity: 0; pointer-events: none; z-index: -1;')
       obj.onload = EleResize._handleObjectLoad
       obj.type = 'text/html'
       ele.appendChild(obj)
       obj.data = 'about:blank'
       return obj
     },
     _handleObjectLoad: function (evt) {
       this.contentDocument.defaultView.__resizeTrigger__ = this.__resizeElement__
       this.contentDocument.defaultView.addEventListener('resize', EleResize._handleResize)
     }
   }
   if (document.attachEvent) { // ie9-10
     EleResize.on = function (ele, handler, context) {
       var handlers = ele.__z_resizeListeners
       if (!handlers) {
         handlers = []
         ele.__z_resizeListeners = handlers
         ele.__resizeTrigger__ = ele
         ele.attachEvent('onresize', EleResize._handleResize)
       }
       handlers.push({
         handler: handler,
         context: context
       })
     }
     EleResize.off = function (ele, handler, context) {
       var handlers = ele.__z_resizeListeners
       if (handlers) {
         EleResize._removeHandler(ele, handler, context)
         if (handlers.length === 0) {
           ele.detachEvent('onresize', EleResize._handleResize)
           delete ele.__z_resizeListeners
         }
       }
     }
   } else {
     EleResize.on = function (ele, handler, context) {
       var handlers = ele.__z_resizeListeners
       if (!handlers) {
         handlers = []
         ele.__z_resizeListeners = handlers
   
         if (getComputedStyle(ele, null).position === 'static') {
           ele.style.position = 'relative'
         }
         var obj = EleResize._createResizeTrigger(ele)
         ele.__resizeTrigger__ = obj
         obj.__resizeElement__ = ele
       }
       handlers.push({
         handler: handler,
         context: context
       })
     }
     EleResize.off = function (ele, handler, context) {
       var handlers = ele.__z_resizeListeners
       if (handlers) {
         EleResize._removeHandler(ele, handler, context)
         if (handlers.length === 0) {
           var trigger = ele.__resizeTrigger__
           if (trigger) {
             trigger.contentDocument.defaultView.removeEventListener('resize', EleResize._handleResize)
             ele.removeChild(trigger)
             delete ele.__resizeTrigger__
           }
           delete ele.__z_resizeListeners
         }
       }
     }
   }
   export {EleResize}

2. 使用echarts的vue页面引入该js

   import { EleResize } from '../../../assets/js/esresize';

   

    

    let listener = function() {
        myChart.resize();
   };
               EleResize.on(document.getElementById('CompanyLevelCount'), listener);

   优点：

   1. 可以根据窗口大小实现自适应
   2. 页面跳转不会执行上次操作
   3. 多个方法不会覆盖