防抖函数

mounted() {
    const refresh = this.debounce(this.$refs.scroll.refresh, 500);

    this.$bus.$on("imgLoad", () => {
      refresh();
    });
  },
  methods: {
    /**
     * 防抖函数
     */
    debounce(fun, delay) {
      let timer = null;
      return function(...args) {
        if (timer) clearTimeout(timer);
        timer = setTimeout(() => {
          fun.apply(this, args);
        }, delay);
      };
    },
}