几乎和reWrite()一样的代码,为什么我的Write()不调用?

 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"><title>Writing to Same Doc</title>
<script language="JavaScript">
    function reWrite(){
        // assemble content for new window
        var newContent = "<html><head><title>A New Doc</title></head>"
        newContent += "<body bgcolor='aqua'><h1>This document is brand new.</h1>"
        newContent += "Click the Back button to see original document."
        newContent += "</body></html>"
        // write HTML to new window document
        document.write(newContent)
        document.close() // close layout stream
    }

    function Write(){
        // assemble content for new window
        var Content = "<html><head><title>A New Doc</title></head>"
        Content += "<body bgcolor='aqua'><h1>This document is brand new1.</h1>"
        Content += "Click the Back button to see original document."
        Content += "</body></html>"
        // write HTML to new window document
        douument.write(Content)
        //document.close() // close layout stream
    }
</script>
</head>

<body>
<form>
    <input type="button" value="Replace Content" onClick="reWrite()">
    <input type="button" value="Replace" onClick="Write()">
</form>
</body>
</html>

douument.write(Content)

docu===》douu

document.write(Content)