fmpq.com
源代码：
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<!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" max="100"> <button onclick="myFunction()">验证</button> <p>如果输入的数字大于 100 ( input 的 max 属性), 会显示错误信息。</p> <p id="demo"></p> <script> function myFunction() { var txt = ""; if (document.getElementById("id1").validity.rangeOverflow) { txt = "输入的值太大了"; } else { txt = "输入正确"; } document.getElementById("demo").innerHTML = txt; } </script> </body> </html>
运行结果