jquery Extend解决复制反向赋值问题

//一下会导致lockerBoxListbak里也会多出一条ttt push的一条记录
var ttt = this.lockerBoxListbak;
ttt.push({
                      ID: row.BoxID,
                      LockerId: row.LockerId,
                      BoxDisplayName: row.BoxDisplayName,
                      BoxIndex: row.BoxIndex,
                      SlaveBoard: 0,
                       SlaveBoardMapping: 0,
                   });