如果您查看控制器的源代碼,這是因爲它們爲每個時區區域呈現一個插槽。例如:
<option value="America/Boise" >MST, Mountain Standard Time -7:0.0</option>
<option value="America/Cambridge_Bay" >MST, Mountain Standard Time -7:0.0</option>
<option value="America/Chihuahua" >MST, Mountain Standard Time -7:0.0</option>
<option value="America/Dawson_Creek" >MST, Mountain Standard Time -7:0.0</option>
<option value="America/Denver" >MST, Mountain Standard Time -7:0.0</option>
<option value="America/Edmonton" >MST, Mountain Standard Time -7:0.0</option>
<option value="America/Hermosillo" >MST, Mountain Standard Time -7:0.0</option>
<option value="America/Inuvik" >MST, Mountain Standard Time -7:0.0</option>
我會說這是一個錯誤。我認爲它應該包括城市名稱,或者摺疊重複值,因爲沒有辦法區分它們。
There is a JIRA open for this。請投票。