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Tryit: JAVASCRIPT
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<!DOCTYPE html> <html> <body> <h2>JavaScript 可以验证输入</h2> <p>请输入 1 到 10 之间的数字：</p> <input id="numb"> <button type="button" onclick="myFunction()">提交</button> <p id="demo"></p> <script> function myFunction() { var x, text; // 获取id="numb"的输入框的值 x = document.getElementById("numb").value; // 如果 x 不是数字或小于 1 或大于 10 if (isNaN(x) || x < 1 || x > 10) { text = "Input not valid"; } else { text = "Input OK"; } document.getElementById("demo").innerHTML = text; } </script> </body> </html>