html 自制属性

HTML5 允许扩展的（自制的）属性，以 data- 开头

<label id="id0" data-value="0">0</label>
<label id="id1" data-value="1">1</label>

<script>
    var id0Value = ("$id0").attr("data-value");
    var id1Value = ("$id1").attr("data-value");
    alert('id0 value is' + id0Value);
    alert('id1 value is' + id1Value);
</script>

示例代码：
https://github.com/zLulus/NotePractice/blob/dev3/Website/NotePractice/Views/Js/CustomerProperty.cshtml