簡單的各種輸出循環

1, 輸出1到100

for (i=1;i<=100;i++){
document.write(i,' ');
if (i%10==0) document.write('<br>');
}

2輸出1到100的素數

for (var i = 2; i <= 100; i += 2)
 document.write(i+" ");

3輸出1到100的偶數

for (var i = 1; i <= 100; i += 2)
  document.write(i+" ");

4輸出1到100的素數按5排列

function Sushu(){

    var l=0;

        for(var i=1;i<100;i+=2){

            var b = false;

            for (var k = 2; k < i; k++) {

                if (i%k==0) {

                    b = true;

                }

            }

            if (!b) {

                if(i==1){document.write('2,');l++;

                }else if(l%5==0){

                    document.write(i+',<br />');

                }else{

                    document.write(i+',');

                }

                l++;

            }

        }

    }

    Sushu();