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Input Number stepUp() 方法
tryjsref_number_stepup
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<!DOCTYPE html> <html> <body> Number: <input type="number" id="myNumber"> <p>Click the button to increment the value of the number field by 5 (each time you click).</p> <button onclick="myFunction()">Try it</button> <p><strong>Note:</strong> The stepUp() method is not supported by Internet Explorer.</p> <script> function myFunction() { document.getElementById("myNumber").stepUp(5); } </script> </body> </html>