javascript - 使用枚举定义另一个枚举

Question

在 JavaScript 中是否允许使用一个 Enum 来定义另一个 Enum？

var VESSEL_DOCUMENT_SUB_TYPE = {
//  PLAN_TYPE           :   {
//      
//  },
    /** @enum {Number} */
    CERTIFICATE_TYPE    :   {
        BUNKER_OIL_POLLUTION_DAMAGE :   CERTIFICATE_TYPE.BUNKER_OIL_POLLUTION_DAMAGE,
        P_I_COE                     :   CERTIFICATE_TYPE.P_I_COE,
        H_M_SINGLE_COVER_NOTE       :   CERTIFICATE_TYPE.H_M_SINGLE_COVER_NOTE
    }/*,
    OTHER               :   {

    }*/
};

var CERTIFICATE_TYPE = {
    /** Bunker Oil Pollution Damage */
    BUNKER_OIL_POLLUTION_DAMAGE :   0,
    /** P&I (COE) */
    P_I_COE                     :   1,
    /** H&M Single Cover Note */
    H_M_SINGLE_COVER_NOTE       :   2
};

Answer 1

是的，这是允许的。唯一的问题是，我收到运行时错误，因为 CERTIFICATE_TYPE 应该在 VESSEL_DOCUMENT_SUB_TYPE

之前定义

var CERTIFICATE_TYPE = {
    /** Bunker Oil Pollution Damage */
    BUNKER_OIL_POLLUTION_DAMAGE :   0,
    /** P&I (COE) */
    P_I_COE                     :   1,
    /** H&M Single Cover Note */
    H_M_SINGLE_COVER_NOTE       :   2
};

var VESSEL_DOCUMENT_SUB_TYPE = {
//  PLAN_TYPE           :   {
//      
//  },
    /** @enum {Number} */
    CERTIFICATE_TYPE    :   {
        BUNKER_OIL_POLLUTION_DAMAGE :   CERTIFICATE_TYPE.BUNKER_OIL_POLLUTION_DAMAGE,
        P_I_COE                     :   CERTIFICATE_TYPE.P_I_COE,
        H_M_SINGLE_COVER_NOTE       :   CERTIFICATE_TYPE.H_M_SINGLE_COVER_NOTE
    }/*,
    OTHER               :   {

    }*/
};