JavaScript学习记录

年龄层判断

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>年龄层判断</title>
</head>
<body>
<script>
var age=19;
if(age>=18){
alert("adult");
}else if(age>=6){
alert("teenager");
}else{
alert("kid");
}
if(age){
document.write("Hello");
}else{
document.write("BYE");
}
</script>
</body>
</html>

 

prompt()方法及动态输入实现矩形周长面积计算

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>矩形周长面积计算</title>
</head>
<body>
<script>
var w=prompt("请输入矩形的宽","1");
var h=prompt("请输入矩形的高","1");
alert("矩形的周长为："+2*(parseFloat(h)+parseFloat(w)));
alert("矩形的面积为："+h*w);
</script>
</body>
</html>

posted @ 2021-10-12 17:03  枫叶鎏霜  阅读(53)  评论(0)    收藏  举报