for - break

   for (int i = 0; i < 10; i++) {
       if (i == 5) {
           break;
       }
       NSLog(@"%d",i);
   }

2021-02-14 13:43:01.381145+0800 multithreading[36561:13680387] 0
2021-02-14 13:43:01.381433+0800 multithreading[36561:13680387] 1
2021-02-14 13:43:01.381550+0800 multithreading[36561:13680387] 2
2021-02-14 13:43:01.381657+0800 multithreading[36561:13680387] 3
2021-02-14 13:43:01.381752+0800 multithreading[36561:13680387] 4

for -continue

    for (int i = 0; i < 10; i++) {
        if (i == 5) {
            continue;;
        }
        NSLog(@"%d",i);
    }

2021-02-14 13:45:11.739404+0800 multithreading[36625:13683579] 0
2021-02-14 13:45:11.739533+0800 multithreading[36625:13683579] 1
2021-02-14 13:45:11.740154+0800 multithreading[36625:13683579] 2
2021-02-14 13:45:11.740287+0800 multithreading[36625:13683579] 3
2021-02-14 13:45:11.740415+0800 multithreading[36625:13683579] 4
2021-02-14 13:45:11.741378+0800 multithreading[36625:13683579] 6
2021-02-14 13:45:11.741472+0800 multithreading[36625:13683579] 7
2021-02-14 13:45:11.741568+0800 multithreading[36625:13683579] 8
2021-02-14 13:45:11.741649+0800 multithreading[36625:13683579] 9

while -break

    for (int i = 0; i < 10; i++) {
        if (i == 5) {
            continue;;
        }
        NSLog(@"%d",i);
    }

2021-02-14 13:46:13.206855+0800 multithreading[36644:13684516] 0
2021-02-14 13:46:13.207093+0800 multithreading[36644:13684516] 1
2021-02-14 13:46:13.207323+0800 multithreading[36644:13684516] 2
2021-02-14 13:46:13.207447+0800 multithreading[36644:13684516] 3
2021-02-14 13:46:13.207627+0800 multithreading[36644:13684516] 4

while - continue

    int i = 0;
    while (i < 10) {
        if (i == 5) {
            continue;
        }
        NSLog(@"%d",i);
        i++;

    }

2021-02-14 13:46:47.111638+0800 multithreading[36664:13685416] 0
2021-02-14 13:46:47.111771+0800 multithreading[36664:13685416] 1
2021-02-14 13:46:47.111860+0800 multithreading[36664:13685416] 2
2021-02-14 13:46:47.111964+0800 multithreading[36664:13685416] 3
2021-02-14 13:46:47.112049+0800 multithreading[36664:13685416] 4

注意:while使用continue，后面的i++不会执行，所以下一次循环i人就等于5，循环永远出不去。