v-for循环遍历数据永远不要把v-if和v-for同时用在同一个元素上。风格指南 — Vue.jsVue.js - The Progressive JavaScript Frameworkhttps://cn.vuejs.org/v2/style-guide/#%E9%81%BF%E5%85%8D-v-if-%E5%92%8C-v-for-%E7%94%A8%E5%9C%A8%E4%B8%80%