DEFINE ADD_FIELD.
    WA_FIELD-FIELDNAME = &1.                "内表里的字段
    WA_FIELD-REPTEXT_DDIC = &2.             "在ALV里显示的名字
    WA_FIELD-JUST = &3.                     "水平对齐方式，L左对齐，R右对齐。
    WA_FIELD-NO_OUT = &4.                   "
    WA_FIELD-INTLEN = &5.                   "输出列的宽度
    WA_FIELD-EMPHASIZE = &6.                "输出背影色
    WA_FIELD-KEY = &7                       "设为X就是主键
    APPEND WA_FIELD TO IT_FIELD.
END-OF-DEFINITION.