plase set your data option like this, to fixed

data() {
    return {
...
            editStaffData: {
        dept: []
      }
...
    }

@shimangdian 我发现问题了，在我本地还对editStaffData先进行了直接赋值，再对editStaffData.dept进行赋值，Vue这样赋值不能直接检测到数据的变化。
https://codepen.io/rehack/pen/poyLvdJ

@luvtian 👍

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