<!DOCTYPE html>
<html lang="zh-CN">
<head>
<meta charset="utf-8" />
<title>水仙花</title>
<script>
var str = "";
for (var i = 100; i < 1000; i++)
{
var a = i % 10;
var b = (i / 10) % 10;
b = parseInt(b);
var c = i / 100;
c = parseInt(c);
if (i == (a * a * a + b * b * b + c * c * c))
{
str = str + i + "、";
}
}
document.write("水仙花数有：" + str);
</script>
</head>
<body>
</body>
</html>
<!DOCTYPE html>
<html lang="zh-CN">
<head>
<meta charset="utf-8" />
<title>统计某一个字符的个数</title>
<script>
var str = "good good study,day day up";
var n = 0;
for(var i=0;i<str.length;i++)
{
var char = str.charAt(i);
if (char.toLowerCase() == "o") {
n++;
}
}
document.write("字符串中含有" + n + "个字母o");
</script>
</head>
<body>
</body>
</html>
html复制代码
<!DOCTYPE html>
<html lang="zh-CN">
<head>
<meta charset="utf-8" />
<title>统计字符串中有多少个数字</title>
<script>
var str = "12aaaa 55bb5";
var n = 0;
for(var i=0;i<str.length;i++)
{
var char = str.charAt(i);
if (char!=0 && !isNaN(char)) {
n++;
}
}
document.write("字符串中含有" + n + "个数字");
</script>
</head>
<body>
</body>
</html>
html复制代码
<!DOCTYPE html>
<html lang="zh-CN">
<head>
<meta charset="utf-8" />
<title>数组与字符串的转换操作</title>
<script>
var str1="我爱学习";
var str2=str1.split("").join("><");
var arr=str2.split("");
arr.unshift("<");
arr.push(">");
var result=arr.join("");
document.write(result);
</script>
</head>
<body>
</body>
</html>
html复制代码
<!DOCTYPE html>
<html lang="zh-CN">
<head>
<meta charset="utf-8" />
<title>计算面积与体积，返回一个数组</title>
<script>
function get(a,b,c){
var S = 2*(a*b+a*c+b*c);
var V = a*b*c;
var arr=[S,V];
return arr;
}
var a=get(1,2,3);
document.write("表面积为"+a[0]+"<br/>");
document.write("体积为"+a[1]);
</script>
</head>
<body>
</body>
</html>
html复制代码
<!DOCTYPE html>
<html lang="zh-CN">
<head>
<meta charset="utf-8" />
<title>显示时间</title>
<script>
var d = new Date();
var myYear=d.getFullYear();
var myMonth=d.getMonth()+1;
var myDay=d.getDate();
var weekday=["日","一","二","三","四","五","六"];
var myWeek=weekday[d.getDay()];
document.write("今天是"+myYear+"年"+myMonth+"月"+myDay+"日"+" "+ "星期"+myWeek);
</script>
</head>
<body>
</body>
</html>
html复制代码
<!DOCTYPE html>
<html lang="zh-CN">
<head>
<meta charset="utf-8" />
<title>生成随机验证码</title>
<script>
var str = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890";
var arr = str.split("");
var result = "";
for(var i=0;i<4;i++)
{
var n = Math.floor(Math.random() * arr.length);
result += arr[n];
}
document.write(result);
</script>
</head>
<body>
</body>
</html>
html复制代码
<!DOCTYPE html>
<html lang="zh-CN">
<head>
<meta charset="utf-8" />
<title>生成随机颜色值</title>
<script>
var r = Math.floor(Math.random() * (255 + 1));
var g = Math.floor(Math.random() * (255 + 1));
var b = Math.floor(Math.random() * (255 + 1));
var rgb = "rgb(" + r + "," + g + "," + b + ")";
document.write(rgb);
</script>
</head>
<body>
</body>
</html>
