vue+echart+自定义指令：自适应图表

vue+echart+自定义指令：自适应图表，图表根据宽高拉伸变化而重置变化。

之前有用到过其它方式实现，现在只用指令来实现：

<template>
<div class="box">
 <div ref="zhex" v-resize="resize" style="width:40%;height:100%;bakcground:pink;">
  </div>
</div>
</template>
<script>
import * as echarts from 'echarts'
export default {
  name: '',
  data() {
    return {
     opt:null
    }
  },
  mounted() {
    this.zhexchartInit()
  },
  directives:{
    resize:{
        bind(el,binding){
            let width=""
            let height=""
            function isResezi(){
                const style = document.defaultView.getComputedStyle(el);
                if(width!==style.width||height!==style.height){
                    binding.value() // 关键
                }
                width = style.width
                height = style.height
            }
            el.__vueSetInterval__ = setInterval(isResezi,300)
        },
        unbind(el){
            clearInterval(el.__vueSetInterval__)
        }
    }
  },
  methods: {
    resize(){
        console.log('changed---')
        this.myChart.clear()
        this.myChart.setOption(this.opt)
    },
    //   折线图表
    zhexchartInit() {
      this.myChart = echarts.init(this.$refs.zhex)
      this.opt = {
       xAxis: {
    type: 'category',
    data: ['Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat', 'Sun']
  },
  yAxis: {
    type: 'value'
  },
  series: [
    {
      data: [120, 200, 150, 80, 70, 110, 130],
      type: 'bar',
      showBackground: true,
      backgroundStyle: {
        color: 'rgba(180, 180, 180, 0.2)'
      }
    }
  ]
      }
      this.myChart.setOption(this.opt)
    }
  },
  components: {}
}
</script>
<style scoped lang="less">
.box{
    width:100%;
    height:100vh;
    background:peachpuff;
    p{font-size:30px;}
}
</style>

这个图表就会根据div的改变而重载，这里涉及两个知识点，一个是指令相关，一个是重绘图表