循环中断的层数的含义: for(....) //循环1 {for(...) //循环2{for(...) //循环3{break ; //中断循环3break 1; //中断循环3break 2; //中断循环2break 3; //中断循环1//continue道理一样!}break 1; //中断循环2break 2; //中断循环1} break 1; //中断循环1 } //.......