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JavaScript 验证 API
tryjsref_validation_rangeOverflow
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<!DOCTYPE html> <html> <body> <h1>JavaScript Validation API</h1> <p>Enter a number and click OK:</p> <input id="id1" type="number" max="100"> <button onclick="myFunction()">OK</button> <p>If the number is greater than 100 (the input's max attribute), an error message will be displayed.</p> <p id="demo"></p> <script> function myFunction() { let text; if (document.getElementById("id1").validity.rangeOverflow) { text = "Value too large"; } else { text = "Input OK"; } document.getElementById("demo").innerHTML = text; } </script> </body> </html>