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Input Range stepDown() 方法
tryjsref_range_stepdown2
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<!DOCTYPE html> <html> <body> Points: <input type="range" id="myRange" value="60"> <p>Click the button to decrement the value of the slider control by "1" (each time you click).</p> <button onclick="myFunction()">Try it</button> <script> function myFunction() { document.getElementById("myRange").stepDown(); } </script> </body> </html>