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<!DOCTYPE html> <html> <body> <h1>input step 属性</h1> <p>step 属性指定输入元素的合法数字间隔。</p> <form action="/action_page.php"> <label for="points">积分：</label> <input type="number" id="points" name="points" step="3"> <input type="submit" value="提交"> </form> </body> </html>