组件中图片加载完成，执行$emit

组件中图片加载完成，执行$emit

watch: {
	//detailInfo是props传过来的值
    detailInfo() {
    	//imagesLength统计图片的数量
    	this.imagesLength = this.detailInfo.detailImage[0].list.length;
    }
}

@load="imgLoad"

imgLoad() {
      // count=0当图片加载完count === imageLength
      if (++this.count === this.imagesLength) {
        this.$emit("imgLoad");
      }
}