需求背景，彈窗進去顯示詳情，如下：
點擊修改后，表單可輸入
一開始做的思路是獲取到詳情后直接給表單用setFieldsValue方法賦值，結果一直報錯，我使用的v-if 和v-else顯示詳情和可編輯狀態，剛打開彈窗的時候input是不存在的，所以getFieldDecorator方法中的field也不存在，是無法賦值的，最后在點擊“修改”按鈕之后再去用setFieldsValue賦值就可以了，這個問題足足困擾了我大半個小時，頭疼，特此記下以防下次忘記。
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