基础

条件

window.onload = function () {
    var kWeWeZhang = prompt("请输入数值");
    if(kWeWeZhang%5 && kWeWeZhang%6) {
        window.console.log("不能被5 也 不能被6");
    }else if(kWeWeZhang%6) {
        window.console.log("能被5  不能被6");
    }else if(kWeWeZhang%5) {
        window.console.log("不能被5  能被6");
    }else{
        window.console.log("能被5 也 能被6");
    }
}  

循环

window.onload = function () {
    for(var i = 0;i<100;i++) {
        /*控制台打印输出*/
        window.console.log(i);
    }
}

求因子
window.onload = function () {
    var kWeWeZhang = prompt("请输入数值");
    for(var i=1;i<=kWeWeZhang;i++) {
        if(!(kWeWeZhang%i)) {
            window.console.log(i);
        }
    }
}

求质数

window.onload = function () {
    /*因子的个数*/
    function kYueShuCount(kNumber) {
        if (kNumber<1) return;
        var kCount = 0;
        for(var i=1;i<=kNumber;i++) {
            if(!(kNumber%i))kCount++;
        }
        return kCount;
    }
    /*1到某数之间的所有质数*/
    function kChaXunZhiShu(kNumber) {
        if (kNumber<1) return;
        window.console.log(1);
        for(var i=1;i<=kNumber;i++) {
            if (kYueShuCount(i)==2) window.console.log(i);
        }
    }

    kChaXunZhiShu(100);
}

去掉7的倍数或7结尾的数
window.onload = function () {
    var kWeWeZhang = prompt("请输入数值");
    for(var i=1;i<=kWeWeZhang;i++) {
        if(i%7 && i%10%7) {
            window.console.log(i);
        }
    }
}

水仙花数
每一位上的数字的立方和等于该数 
window.onload = function () {
    for(var i=100;i<=999;i++) {
        var ge = parseInt(i%10);
        var shi = parseInt(i/10%10);
        var bai = parseInt(i/100%10);
        var result = Math.pow(ge,3)+Math.pow(shi,3)+Math.pow(bai,3);
        if (i==result) window.console.log(i);
    }
}

阶乘

window.onload = function () {
    var kWeWeZhang = prompt("");
    var resoult = 1;
    for(var i=1;i<=parseInt(kWeWeZhang);i++) {
        resoult*=i;
    }
    window.console.log(resoult);
}

斐波那契数列
0 1 1 2 3 5 8 13 21 。。。

window.onload = function () {
    /*斐波那契数*/
    function kFeiBoNaQi(kIndex) {
        if (kIndex < 1) return 0;
        if (kIndex == 1) {
            return 0;
        } else if (kIndex == 2) {
            return 1;
        } else {
            return kFeiBoNaQi(kIndex - 1) + kFeiBoNaQi(kIndex - 2);
        }
    }

    for (var i = 1; i<=20; i++) {
        window.console.log(kFeiBoNaQi(i));
    }
}

青蛙掉进10米深的井里，每次跳3米，下滑2米，问几次可以跳出井？

　　var nResult = 0;
    var nCount = 0;
    while(true) {
        nCount++;
        nResult+=3;
        if(nResult>=10) break;
        nResult-=2;
    }
    console.log(nCount);

妈妈给小明100元买鸡，公鸡3元 母鸡5元 小鸡1元三只 ，如何用100元买到100
只鸡 每种鸡都要买到

    for (var countMu = 1;countMu<100/5;countMu++){
        for (var countGong = 0;countGong<(100-5*countMu)/3;countGong++){
            var countXiao = (100-5*countMu-3*countGong)*3;
            if (countMu+countGong+countXiao==100){
                console.log(countMu+"~"+countGong+"~"+countXiao);
            }
        }
    }