<template>
  <div :id="chartId" :style="style"></div>
</template>

<script>
import * as echarts from "echarts";
//防抖
const debounce = function (fn, delay) {
  let timer = null;
  return function () {
    let content = this;
    let args = arguments;
    if (timer) {
      clearTimeout(timer);
    }
    timer = setTimeout(() => {
      fn.apply(content, args);
    }, delay);
  };
};
export default {
  name: "yw-echarts",
  props: {
    height: {
      type: String,
      default: "500px",
    },
    width: {
      type: String,
      default: "500px",
    },
    options: {
      type: Object,
      default: null,
    },
    chartId: {
      type: [String, Number],
      default: null,
    },
    minHeight: {
      type: String,
      default: "none",
    },
  },
  data() {
    return {
      myCharts: null, //echarts實例
    };
  },
  computed: {
    style() {
      return {
        height: this.height,
        width: this.width,
        minHeight: this.minHeight,
      };
    },
  },
  watch: {
    options: {
      handler(newVal, oldVal) {
        if (this.options) {
          // this.myCharts.clear();
          this.myCharts.setOption(newVal, true);
        } else {
          this.initChart();
        }
      },
      deep: true,
    },
  },
  created() {
    // 防抖優(yōu)化
    this.handleResize = debounce(() => {
      this.myCharts.resize();
    }, 300);
  },
  mounted() {
    this.initChart();
  },
  beforeDestroy() {
    if (!this.myCharts) return;
    // 移除監(jiān)聽
    window.removeEventListener("resize", this.handleResize);
    // 銷毀echarts實例
    this.myCharts.clear();
    this.myCharts.dispose();
    this.myCharts = null;
  },
  methods: {
    initChart() {
      this.$nextTick(() => {
        if (!this.myCharts) {
          this.myCharts = echarts.init(document.getElementById(this.chartId));
        }
        if (this.options) {
          this.myCharts.setOption(this.options, true);
        }
        if (this.myCharts) window.addEventListener("resize", this.handleResize);
      });
    },
  },
};
</script>

<style lang="scss" scoped></style>

      <Echarts
        :height="echartsNxObj.height"
        :width="echartsNxObj.width"
        :options="echartsNxObj.options"
        :chartId="echartsNxObj.chartId"
        
      />