<input type="text" id="txtBox" displayName="123456" />
获取自定义属性值:
document.getElementById("txtBox").getAttribute("displayName");
document.getElementById("txtInput").attributes["displayName"].nodeValue
设置自定义属性值:
document.all.txtBox.setAttribute("displayName ","123456");
document.getElementById("txtInput").attributes["displayName"].nodeValue = "123456"