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JavaScript 代码实例
查看JavaScript的代码实例源码， 并使用JS参考的在线编程调试工具
源代码
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<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>