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计算2的n次幂,n可输入,n为自然数
规律:12
122
1222
var n = parseInt(window.prompt(‘input’));
var mul = 1;
for (var i = 0; i < n; i ++) {
mul *= 2;
}
document.write(mul)-
计算n的阶乘,n可输入
5 = 543211
4 = 43211
3 = 3211
var n = parseInt(window.prompt(‘input’));
var mul = 1;
for (i = 1;i <= n;i++){
mul *= i;
}
document.write(mul) -
输入a,b,c,三个数打印出最大的
var a = parseInt(window.prompt(‘input’));
var b = parseInt(window.prompt(‘input’));
var c = parseInt(window.prompt(‘input’));
if(a > b){
if (a > c) {
document.write(a);
}else{
document.write©;
}
}else{
if (b > c){
document.write(b);
}else{
document.write©;
}
}- 编写一个程序,输入三位数的正整数,输出时反向输出。如:123,321
var n = parseInt(window.prompt(‘input’));
var a,b,c;
a = n % 10;
b = (n % 100 - a) / 10;
c = (n - n % 100) /100
var mul = a * 100 + b * 10 + c;
document.write(mul)var n = parseInt(prompt(‘输入一个三位数’));
var a,
b,
c;
a = (n - (n % 100)) / 100; //取百位
c = n % 10; //取各位
b = (n % 100 - c) / 10; //取十位var m = c * 100 + b * 10 + a; document.write(m);
456 654
a 456%10=6
b 456%100=56 56-6
c 456-(456%100)
m=6*100+50+4
var n = parseInt(window.prompt(‘input’))
var a,
b,
c;
a = (n - (n % 100)) / 100;
c = n % 10;
b = (n % 10 - c) / 10;
var mul = c * 100 + b * 10 + a;
document.write(mul);-
著名的斐波那契数列,1 1 2 3 5 8输出第n项
var n = parseInt(window.prompt(‘input’));
// 1 1 2 3 5 8
// f s t
var first = 1;
var second = 1;
var third;
if (n > 2){
for (i = 0;i < n-2;i ++){
third = first + second;
first = second;
second = third;
}
document.write(third)
}else{
document.write(1)
} -
打印100以内的质数。
var count = 0;
for (var i = 1;i < 100;i++){
for (var j = 1;j <= i;j++){
if (i % j == 0){
count++;
}
}if (count == 2){
document.write(i+" “);
}
count = 0;
}
// 另一种方法Math.sqrt()开方数
var count = 0;
for (var i = 2;i < 100;i++){
for (var j = 1;j <= Math.sqrt(1);j++){
if (i % j == 0){
count++;
}
}if (count == 1){
document.write(i+” ");
}
count = 0;
var count = 0;
for(i = 1;i < 100;i++){
for(j = 1;j <= i;j++){
if(i % j == 0){
count ++
}
}
if(count == 2){
document.write(i)
}
count = 0;
}
var i = 0;
while(1){
i ++;
console.log(i);
if(i > 100){
break;
}
}
-
JavaScript中变量练习题
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转载自blog.csdn.net/weixin_43917517/article/details/86299424
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