第3题
打印倒正金字塔
<!DOCTYPE html>
<html>
<head lang="en">
<meta charset="UTF-8">
<title>金字搭</title>
<style type="text/css">
div{text-align: center; }
hr{width:50px;display: inline-block}
</style>
</head>
<body>
<div>
<h2>打印倒正金字搭直线</h2>
<script type="text/javascript">
for(var i=8;i>2;i--){
for(var j=0;j<i-1;j++){
document.write("<hr/>");
}
document.write("<br />");
}
for(var n=1;n<=7;n++){
for(var h=0;h<n;h++){
document.write("<hr/>");
}
document.write("<br />");
}
</script>
</div>
</body>
</html>
2.验证邮箱
<!DOCTYPE html>
<html lang="en">
<meta charset="UTF-8">
<title>邮件地址</title>
</head>
<body>
<script type="text/javascript">
function aa (email) {
if (email == "") {
alert("邮箱不能为空")
} else if (email.split("@").length == 1 || email.split(".").length == 1) {
alert("邮箱地址必须是@和.")
}
else {
alert("邮箱地址正确,邮箱名称为:"+email.substring(0,))
}
}
</script>
<input type="button" value=" 邮件" onclick="aa(prompt('请输入正确的邮件地址','[email protected]'))"/>
</body>
</html>
3.
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>星期几</title>
<script type="text/javascript">
function aa(day) {
switch(day){
case "星期一":
alert("新的一周开始了")
break
case "星期二":
alert("努力工作")
break
case "星期三":
alert("努力工作")
break
case "星期四":
alert("努力工作")
break
case "星期五":
alert("明天就是周末了")
break
case "星期六":
alert("放松的休息")
break
case "星期日":
alert("放松的休息")
break
}
}
</script>
</head>
<body>
<input type="button" value=" 星期几" onclick="aa(prompt('请输入今天星期几:',))"/>
</body>
</html>