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代码编辑器：

<h3>This demonstrates a parser error:</h3>
<script>
var xmldoc = null;
function loadxml(filename)
{
    if (window.ActiveXObject) {
        xmldoc = new ActiveXObject("Microsoft.XMLDOM");
        xmldoc.async = false;
        xmlDoc.validateOnParse="true"
        xmldoc.load(filename);
    }
    else if (document.implementation && document.implementation.createDocument)
    {
        var xmlhttp = new window.XMLHttpRequest();
        xmlhttp.open("get", filename, false);
        xmlhttp.send(null);
        var parser = new DOMParser();
        var xmldoc = parser.parseFromString(xmlhttp.responseText, "application/xml");
        console.log(xmldoc.parseError);
    } else {
        xmldoc = null;
    }
    return xmldoc;
}

xmldoc = loadxml("/static/exam/dtde/note_dtd_error.xml")

document.write("<br />Error Code: ")
document.write(xmldoc.parseError.errorCode)
document.write("<br />Error Reason: ")
document.write(xmldoc.parseError.reason)
document.write("<br />Error Line: ")
document.write(xmldoc.parseError.line)
</script>

代码编辑器：

运行结果：