HTML DOM Input Week stepDown( ) 方法

htmlweb developmentfront end technology更新于 2025/9/11 8:44:17

HTML DOM Input Week stepDown() 方法定义周字段应减少的周数。

语法

以下是语法 −

使用数字调用 stepDown() 方法，默认情况下该数字等于 1

inputWeekObject.stepDown(number)

示例

让我们看一个 Input Week stepDown() 方法的示例 −

<!DOCTYPE html>
<html>
<head>
<title>Input Week stepDown()</title>
<style>
   form {
      width:70%;
      margin: 0 auto;
      text-align: center;
   }
   * {
      padding: 2px;
      margin:5px;
   }
   input[type="button"] {
      border-radius: 10px;
   }
</style>
</head>
<body>
<form>
<fieldset>
<legend>Week-stepDown( )</legend>
<label for="WeekSelect">Week and Year :
<input type="week" id="WeekSelect" value="2055-W04">
</label>
<input type="button" onclick="changeStep('2')" value="Decrease Weeks by 2">
<input type="button" onclick="changeStep('3')" value="Decrease Weeks by 3">
</fieldset>
</form>
<script>
   var divDisplay = document.getElementById("divDisplay");
   var inputWeek = document.getElementById("WeekSelect");
   function changeStep(myStep) {
      inputWeek.stepDown(myStep);
   }
</script>
</body>
</html>