function num(n){
if(n==1) return 1;
return num(n-1)+n;
}
num(100);
转载于:https://www.cnblogs.com/peachmeimei/p/8603334.html
function num(n){
if(n==1) return 1;
return num(n-1)+n;
}
num(100);
转载于:https://www.cnblogs.com/peachmeimei/p/8603334.html