循环还是很有意思的:
1) 安全数的作业:
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>安全数</title> </head> <body> <script type="text/javascript"> for(var i = 1;i<=60;i++) { if (i%7!=0 && i%10!=7) { document.write(i+" "); } } </script> </body> </html>
2) 0.01毫米的纸对折30次就不得了了:
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Document</title> </head> <body> <script type="text/javascript"> var j = 0.01; for(var i = 1;i<=30;i++) { j *= 2; } document.write(j/1000+"米"); /*var j = 0.01; var i = 0; while (j<=1000) { j *= 2;// statement i++ } document.write(i);*/ </script> </body> </html>
3) 7个数中的最大值和最小值以及对应的下标:
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>哈哈哈哈哈哈</title> </head> <body> <script type="text/javascript"> var arr = [10,20,35,87,2,14,7]; var max = arr[0]; var min = arr[0]; var maxIndex,minIndex; for(var i = 0; i < 7 ; i++){ if(max < arr[i]) { max = arr[i]; maxIndex = i; } if (min > arr[i]) { min = arr[i]; minIndex = i; } } document.write(max+‘ ‘+maxIndex+"<br>"+min+" "+minIndex); </script> </body> </html>
原文：http://www.cnblogs.com/panbee/p/6132407.html