vue v-if : "TypeError: Cannot read property 'length' of undefined"
在使用v-if判断一个数组大小为0时，会出现 length 是undefined的错误： [Vue warn]: Error in render: "TypeError: Cannot read property 'length' of undefined" 错误代码： <group v-if="item.detailEntityList.length===0" style="margin-top
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