程序7

 1         function Statistics1(str) {
 2             var strcount = 0;
 3             var spacecount = 0;
 4             var numcount = 0;
 5             var othercount = 0;
 6 
 7             for (var i = 0; i < str.length; i++) {
 8                 var tmpstr = str.charAt(i);
 9                 if (tmpstr >= 'a' && tmpstr <= 'z' || tmpstr >= 'A' && tmpstr <= 'Z') {
10                     strcount++;
11                 }
12                 else if (tmpstr === ' ') {
13                     spacecount++;
14                 }
15                 else if (tmpstr >= '0' && tmpstr <= '9') {
16                     numcount++;
17                 }
18                 else {
19                     othercount++;
20                 }
21             }
22             return { "strcount": strcount, "spacecount": spacecount, "numcount": numcount, "othercount": othercount };
23         }

 1         function Statistics2(str) {
 2             var strcount = 0;
 3             var spacecount = 0;
 4             var numcount = 0;
 5             var othercount = 0;
 6             var i = 0;
 7 
 8             while (i < str.length) {
 9                 var tmpstr = str.charAt(i);
10                 if (tmpstr >= 'a' && tmpstr <= 'z' || tmpstr >= 'A' && tmpstr <= 'Z') {
11                     strcount++;
12                 }
13                 else if (tmpstr === ' ') {
14                     spacecount++;
15                 }
16                 else if (tmpstr >= '0' && tmpstr <= '9') {
17                     numcount++;
18                 }
19                 else {
20                     othercount++;
21                 }
22                 i++;
23             }
24             return { "strcount": strcount, "spacecount": spacecount, "numcount": numcount, "othercount": othercount };
25         }