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| /* | |
| 有些场景下，我们使用el-checkbox的时候，不会通过使用v-model的方式使用它 | |
| 而是通过绑定 :checked="item.isChecked" 并配合 @change 来使用 | |
| 这时，如果 item 数据对象只变化 isChecked 属性，el-checkbox的 checked 属性不会动态变化 | |
| 可能是因为vue复用元素的问题 | |
| 解决方案 给el-checkbox加一个动态的:key = "item.isChecked ? 'filled' : 'none-fill'" | |
| 相当于强行重新渲染了el-checkbox | |
| 这样 checked属性就会随着item.isChecked变化而变化了 | |
| */ |
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