奇數和
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>奇數和</title>
<script type="text/javascript">
var sum =0;
for (var i = 1; i <= 100; i++){
if(i%2!=0){
// alert(i);
sum = sum + i;
}
}alert('奇數和是' + sum);
</script>
</head>
<body>
</body>
</html>
7的倍數和
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>奇數和</title>
<script type="text/javascript">
var sum =0;
for (var i = 1; i <= 100; i++){
if(i%2!=0){
// alert(i);
sum = sum + i;
}
}alert('奇數和是' + sum);
</script>
</head>
<body>
</body>
</html>
水仙花數
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>水仙花</title>
<script type="text/javascript">
for (var i = 100 ; i <= 1000; i++) {
var b = parseInt(i/100);
var s = parseInt((i-b*100)/10);
var g = i%10;
if(b**3 + s**3 + g**3 == i){
alert(i)
}
}
</script>
</head>
<body>
</body>
</html>
質數
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>質數</title>
<script type="text/javascript">
var num = input("輸入一個數字")
if(num > 1 || isNaN(num)){
alert('不合法');
}else{
var floag = true;
for (var i = 2; i < num; i++) {
if (num % i == 0) {
floag = false;
}
}
if(floag){
alert(num + '質數')瞧预；
}else{
alert(num + '合數')哥遮；
}
}
</script>
</head>
<body>
</body>
</html>
質數2
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>質數2</title>
<script type="text/javascript">
for(var i=2; i<=100; i++){
var flag = true;
for(var j = 2; j<i; j++){
if(i%j==0){
flag = false;
break;
}
}
if(flag){
console.log(i);
}
}
</script>
</head>
<body>
</body>
</html>
乘法口訣
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>乘法口訣表</title>
<script type="text/javascript">
for (var i = 1; i <= 9; i++){
for(var j =1; j<=i; j++){
document.write(j + '+' + i + "=" + i*j + ' ');
}
document.write('<br>');
}
</script>
</head>
<body>
</body>
</html>
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