<!DOCTYPE html>
<html xmlns="[http://www.w3.org/1999/xhtml](http://www.w3.org/1999/xhtml)">
<head>
<meta charset="UTF-8">
<title>用户登录</title>
<script type="text/javascript">
var height = parseFloat(prompt('请输入身高（m）:'));
var weight = parseFloat(prompt('请输入体重（kg）:'));
var bmi = weight / Math.pow(height,2);
if(0 < bmi && bmi < 18.5){
alert('过轻');
}else if(18.5 <= bmi && bmi <=25 ){
alert('正常');
}else if(25 < bmi && bmi <=28 ){
alert('过重');
}else if(28 < bmi && bmi <=32 ){
alert('肥胖');
}else if( 32< bmi){
alert('严重肥胖');
}else{
alert('请输入正确的身高体重！！！')
}
</script>
</head>
<body>
</body>
</html>
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李灬殇
<!DOCTYPE html>
<html xmlns="[http://www.w3.org/1999/xhtml](http://www.w3.org/1999/xhtml)">
<head>
<meta charset="UTF-8">
<title>用户登录</title>
<script type="text/javascript">
var height = parseFloat(prompt('请输入身高（m）:'));
var weight = parseFloat(prompt('请输入体重（kg）:'));
var bmi = weight / Math.pow(height,2);
if(0 < bmi && bmi < 18.5){
alert('过轻');
}else if(18.5 <= bmi && bmi <=25 ){
alert('正常');
}else if(25 < bmi && bmi <=28 ){
alert('过重');
}else if(28 < bmi && bmi <=32 ){
alert('肥胖');
}else if( 32< bmi){
alert('严重肥胖');
}else{
alert('请输入正确的身高体重！！！')
}
</script>
</head>
<body>
</body>
</html>