break和continue

continue:满足条件后会在递增之前退出循环，但接下来执行的是下一次训循环；

var num = 0;
for (var i = 1; i < 10; i++) {
    if(i%5 == 0){
        continue;
    }
    num++;
    console.log(num); //12345678
}
alert(num) //8

break:满足条件后便立即退出循环；

var num = 0;
for (var i = 1; i < 10; i++) {
    if(i%5 == 0){
        break;
    }
    num++;
    console.log(num); //1234
}
alert(num) //4