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说明：该篇博客是博主一字一码编写的，实属不易，请尊重原创，谢谢大家！ 问题描述 在主页面通过`this.$bus.$emit` 发送事件传递参数到子页面，子页面在进行`
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vue的数据绑定在刚开始只是和内存建立联系，并没有真正的和后台的数据挂上钩，所以一开始的val.data只是一个空值，必须在之前加个if判断，确保有值以后再开始计算length
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