可能是某个数组属性不存在， 但是判断了他的长度，比如下方代码
<template v-if="arr.length"> <div v-for="(item,idx)in arr" :key="idx"> {{ item }}</div> </template>
解决方法
v-if="arr&&arr.length"
<template v-if="arr&&arr.length"> <div v-for="(item,idx)in arr" :key="idx"> {{ item }}</div> </template>
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