1、JS
var sum = 0;
for(var i = 1; i <= 100; i++){
sum = sum + i;
}
alert(sum);
2、Java
public static void main(String[] args) {
int sum = 0;
for (int i = 0; i <=100 ; i++) {
sum +=i;
}
System.out.println(sum);
}
原文：https://www.cnblogs.com/yusuf/p/13228512.html