無法使用javascript解析本地xml文件

當我嘗試使用簡單的javascript解析本地xml文件時，xhr.open後面的代碼沒有得到執行。無法使用javascript解析本地xml文件

<html> 
<head> 
<script type="text/javascript"> 
function createXMLHttpRequestObject() 
{ 
    if (window.XMLHttpRequest) { 
     xhttp=new XMLHttpRequest(); 
    } else { 
     xhttp=new ActiveXObject("Microsoft.XMLHTTP"); 
    } 

    return xhttp; 
} 

function makeRequest() 
{ 
    var xhr = createXMLHttpRequestObject(); 

    try { 
    xhr.open("GET", 'books.xml', false); 
    xhr.send(null); 
    //xhr.onreadystatechange = function() { 
    //if(this.readyState == 4) { 
     xmlDoc=xhr.responseXML; 
    alert(xmlDoc); 
    //} 
    } 
    } catch(err) { 
     alert("ERROR: " + err.description); 
    } 
} 
</script> 
</head> 
<body> 
    <div onclick="makeRequest();">test<br></div> 
    <div id="out">Output Here</div> 
</body> 
</html>

books.xml文件如下，

<?xml version="1.0" encoding="ISO-8859-1"?> 
<!-- Edited by XMLSpy® --> 

<bookstore> 

    <book category="COOKING"> 
     <title lang="en">Everyday Italian</title> 
     <author>Giada De Laurentiis</author> 
     <year>2005</year> 
     <price>30.00</price> 
    </book> 

    <book category="CHILDREN"> 
     <title lang="en">Harry Potter</title> 
     <author>J K. Rowling</author> 
     <year>2005</year> 
     <price>29.99</price> 
    </book> 

    <book category="WEB"> 
     <title lang="en">XQuery Kick Start</title> 
     <author>James McGovern</author> 
     <author>Per Bothner</author> 
     <author>Kurt Cagle</author> 
     <author>James Linn</author> 
     <author>Vaidyanathan Nagarajan</author> 
     <year>2003</year> 
     <price>49.99</price> 
    </book> 

    <book category="WEB"> 
     <title lang="en">Learning XML</title> 
     <author>Erik T. Ray</author> 
     <year>2003</year> 
     <price>39.95</price> 
    </book> 

</bookstore>

當Internet我發現，搜索「出於安全原因，現代的瀏覽器不允許跨域訪問。」 http://www.w3schools.com/xml/xml_parser.asp

請幫忙。

來源

2011-11-08 Pravin Chikhale