在线运行代码 - 菜鸟教程

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
</head>
<body>

<p>输入数字并点击验证按钮:</p>

<input id="id1" type="number" min="100" max="300" required>
<button onclick="myFunction()">验证</button>

<p>如果输入的数字小于 100 或大于300，会提示错误信息。</p>

<p id="demo"></p>

<script>
function myFunction() {
    var inpObj = document.getElementById("id1");
    if (inpObj.checkValidity() == false) {
        document.getElementById("demo").innerHTML = inpObj.validationMessage;
    } else {
        document.getElementById("demo").innerHTML = "输入正确";
    }
}
</script>

</body>
</html>
源代码

动行结果
