<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>验证是否为数字</title>
<script>
function check() {
var age = document.getElementById("age");
if (age.value == null || age.value == "") {
alert('请输入年龄!');
age.focus();
return;
}
//javascript内置函数isNaN()接收一个字符串类型的参数，如果该参数不是数字，则isNaN()方法返回true,否则返回false
if (isNaN(age.value)) {
alert('年龄必须为数字!');
age.focus();
return;
}
document.getElementById("myform").submit();
}
</script>
</head>
<body>
<form id="myform" action="" method="post">
<input type="text" id="age">
<input type="submit" value="提交" onclick="check()">
</form>
</body>
</html>
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