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Input Date stepDown() 方法
tryjsref_input_date_stepdown
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<!DOCTYPE html> <html> <body> Date: <input type="date" id="myDate" value="2014-05-05"> <p>Click the button to decrement the value of the date field by 5 days (each time you click).</p> <button onclick="myFunction()">Try it</button> <p><strong>Note:</strong> The stepDown() method is not supported by Internet Explorer 11 and earlier versions.</p> <script> function myFunction() { document.getElementById("myDate").stepDown(5); } </script> </body> </html>