1.打印倒金字塔
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>金字塔</title>
<style>
div{
width: 400px;
margin: 0px auto;
text-align: center;
}
hr{
width: 50px;
display: inline-block;
}
</style>
</head>
<body>
<div>
<script type="text/javascript">
document.write("金字塔<h2>")
for(var i=7;i>0;i--){
for(var j=0;j<=i-1;j++){
document.write("<hr/>")
}
document.write("<br/>")
}
for(var i=1;i<=6;i++){
for(var j=0;j<i+1;j++){
document.write("<hr/>")
}
document.write("<br/>")
}
</script>
</div>
</body>
</html>
2.验证邮箱地址的有效性
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>验证邮箱地址</title>
</head>
<body onload="email()">
<script type="text/javascript">
function email() {
var email = prompt("请输入正确的邮箱地址","");
var ema = email.substring(0,email.indexOf("@"));
if(email.indexOf("@")<0||email.indexOf(".")<0){
alert("邮箱名称必须包括@和.");
}else if(email==""){
alert("邮箱名不能为空!");
}else {
alert("邮箱格式正确,邮箱名为:"+ema);
}
}
</script>
</body>
</html>
3.星期周
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body onload="weekday()">
<script type="text/javascript">
function weekday() {
var week = prompt("请输入今天星期几","");
switch (week){
case "星期一":
alert("新的一周开始了");
break;
case "星期二":
case "星期三":
case "星期四":
alert("努力工作");
break;
case "星期六":
case "星期天":
alert("放松的休息")
break;
}
}
</script>
</body>
</html>