tryjsref_week_required2 在线代码实例

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运行代码

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<!DOCTYPE html>
<html>
<body>
<form action="form-action.php">
  周: <input type="week" id="myWeek" name="week_year">
  <input type="submit">
</form>
<p>点击 "点我" 按钮设置 week 字段的 required 属性。</p>
<p><strong>提示:</strong> 在点击 “点我” 按钮前后点击  "提交" 按钮查看效果</p>
<button onclick="myFunction()">点我</button>
<p id="demo"></p>
<script>
function myFunction() {
    document.getElementById("myWeek").required = true;
    document.getElementById("demo").innerHTML = "required 属性已设置。表单提交前 week 字段为必填字段。";
}
</script>
</body>
</html>
 
 
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运行结果
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