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Input Number max 属性
tryjsref_number_max2
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<!DOCTYPE html> <html> <body> Quantity: <input type="number" id="myNumber" min="1" max="5"> <p>Click the button to change the value of the max attribute of the number field.</p> <button onclick="myFunction()">Try it</button> <p id="demo"></p> <script> function myFunction() { var x = document.getElementById("myNumber").max = "10"; document.getElementById("demo").innerHTML = "The value of the max attribute was changed from ''5'' to ''10''."; } </script> </body> </html>