element-ui——Error in render: “TypeError: Cannot read properties of undefined (reading ‘length‘)“

reason: el-checkbox-group 没有绑定 v-model

solution:

<el-checkbox-group v-model="list">
    <div style="display: flex;">
        <el-checkbox
                     v-for="(item, index) in reMarketingList"
                     :key="index"
                     :label="item.label">
        </el-checkbox>
    </div>
</el-checkbox-group>

data (
return  {
list: [], 
reMarketingList: [
{
label: '标签一',
value: 'a'
},
{
label: '标签二',
value: 'b'
}
]
}
)