Uncaught TypeError: Cannot read properties of null (reading 'element')
nnot read properties of null (reading 'index')
错误写法
就是说子组件需要用div包着，你用其他东西，他无法添加key,然后就会报错。
<template #item="{element}">
<Todo :detail="element"></Todo>
</template>
问题
要用div包住自己的子组件
<template #item="{element}">
<div>
<Todo :detail="element"></Todo>
</div>
</template>
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