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<script type="text/javascript">
document.getElementById("ProductDirectorID").setAttribute("class", "hide")
alert(document.getElementById("ProductDirectorID").getAttribute("class", "hide"))
</script>
document.getElementsByClassName('')
$(document).ready(function() {
// do something here
var $retVal=$("#ProductDirectorID");
alert($retVal.attr("class"));
});
document.getElementByID("ProductDirectorID").style.classname="hide"
document.getElementByID("ProductDirectorID").style.classname="hide
var ProductDirectorID=document.getElementById("ProductDirectorID");
if(ProductDirectorID)
{
alert(ProductDirectorID.className);
}
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>无标题页</title>
</head>
<body>
<input id="ProductDirectorID" name="ProductDirectorID" type="text" visible="false" readonly="readonly" class="hide" />
<script type="text/javascript">
alert(document.getElementById('ProductDirectorID').className);
alert(document.getElementById('ProductDirectorID').getAttribute('className'));
alert(document.getElementById('ProductDirectorID').getAttributeNode('class').value);
</script>
</body>
</html>