标签：循环 col tle str oct cal view html write
##打印乘法表
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<body>
<script>
for( var j =1 ; j<10; j++){
for( var i = 1; i <=j; i++){
document.write(j,‘X‘,i,‘=‘,j*i,‘  ‘)
}
document.write(‘<br>‘)
}
</script>
</body>
</html>
打印结果：
1X1=1
2X1=2 2X2=4
3X1=3 3X2=6 3X3=9
4X1=4 4X2=8 4X3=12 4X4=16
5X1=5 5X2=10 5X3=15 5X4=20 5X5=25
6X1=6 6X2=12 6X3=18 6X4=24 6X5=30 6X6=36
7X1=7 7X2=14 7X3=21 7X4=28 7X5=35 7X6=42 7X7=49
8X1=8 8X2=16 8X3=24 8X4=32 8X5=40 8X6=48 8X7=56 8X8=64
9X1=9 9X2=18 9X3=27 9X4=36 9X5=45 9X6=54 9X7=63 9X8=72 9X9=81
##打印*号金字塔
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<body>
<script>
var a = prompt()
for(var b=0;b<=a;b++){
for(var c=0;c<=b;c++){
document.write(‘*‘)
}
document.write(‘<br>‘)
}
</script>
</body>
</html>
打印结果：
*
**
***
****
*****
******
##阶乘累加
1！+2！+3！+...+n!
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<body>
<script>
var res = 0
for(var j=1;j<=3;j++){
var a = 1
for(var i=1;i<=j;i++){
a*=i
}
res += a
}
console.log(res)
</script>
</body>
</html>
##阿基米德与国王的故事
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<body>
<script>
var res = 1
var sum = 1
for(var i=1;i<64;i++){
res = res*2
sum = sum += res
}
// console.log((sum/100000).toFixed(5))
console.log(sum)
</script>
</body>
</html>
结果：18446744073709552000 （国王输惨了）
标签：循环 col tle str oct cal view html write
原文地址：https://www.cnblogs.com/lanbai/p/12623926.html
