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JavaScriptNotes/JS-AC/ac09.js at master · 7256/JavaScriptNotes · GitHub

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//题目9：一只青蛙一次可以跳上1级台阶，也可以跳上2级……它也可以跳上n级。求该青蛙跳上一个n级的台阶总共有多少种跳法。
function jumpFloorII(number)
    if(number == 1){
        return 1;
    if(number == 2){
        return 2;
    tmp = 0;
    while(number > 1){
        tmp+=jumpFloorII(number-1);
        number--;
    return tmp+1;

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