升级所需经验：
1-2级=280经验
Level 2 to 3 = 340
Level 3 to 4 = 460
Level 4 to 5 = 640
Level 5 to 6 = 880
Level 6 to 7 = 1180
Level 7 to 8 = 1150
Level 8 to 9 = 1270
Level 9 to 10 = 1350
Level 10 to 11 = 1425
Level 11 to 12 = 1495
Level 12 to 13 = 1565
Level 13 to 14 = 1685
Level 14 to 15 = 1705
Level 15 to 16 = 1775
Level 16 to 17 = 1870
Level 17 to 18 = 1915
