循环语句练习。
题目：
1、编写程序输入任意一个数，求阶乘。
2、编写程序输出1！+2！+3！+……+6！的结果。
3、输出乘法口诀表，以倒的形式输出。
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>计算阶乘</title>
<script type="text/javascript">
var n = text.value;
function factorial(n){
var factorial = 1;
for(var i=1; i<=n; i++){
factorial = factorial * i;
}
alert(n + "!=" + factorial);
}
</script>
</head>
<body>
<form>
<input type="text" name="text" placeholder="请输入正整数"/>
<input type="button" name="button" value="计算阶乘" onclick="factorial(parseInt(text.value))"/>
</form>
</body>
</html>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>1!+2!+3!+……+6!的结果</title>
<script type="text/javascript">
function factor(num){
var sum = 0, factor = 1;
for(var i=1; i<=num; i++){
factor = factor * i;
sum = sum + factor;
}
return sum;
}
</script>
</head>
<body>
<p>
<script>
document.write("1!+2!+3!+……+6!=",factor(6));
</script>
</p>
</body>
</html>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>乘法口诀表</title>
<script type="text/javascript">
for(var i=9; i>=1; i--){
for(var j=i; j>=1; j--){
document.write(i+"*"+j+"="+i*j+" ");
}
document.write("<br>");
}
</script>
</head>
<body>
</body>
</html>
实验存档。