实例代码“Ctrl+/”提示“F11/ESC”全屏 返回 格式化 恢复 运行
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<html><!DOCTYPE html>
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<html>
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<head>
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<script>
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function loadXMLDoc(url)
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{
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var xmlhttp;
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if (window.XMLHttpRequest)
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  {// code for IE7+, Firefox, Chrome, Opera, Safari
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  xmlhttp=new XMLHttpRequest();
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  }
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else
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  {// code for IE6, IE5
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  xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
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  }
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xmlhttp.onreadystatechange=function()
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  {
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  if (xmlhttp.readyState==4 && xmlhttp.status==200)
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    {
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    document.getElementById('p1').innerHTML="Last modified: " + xmlhttp.getResponseHeader('Last-Modified');
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    }
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  }
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xmlhttp.open("GET",url,true);
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xmlhttp.send();
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}
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</script>
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</head>
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<body>
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​
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<p id="p1">The getResponseHeader() function is used to return specific header information from a resource, like length, server-type, content-type, last-modified, etc.</p>
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<button onclick="loadXMLDoc('/static/example/ajax_info.txt')">Get "Last-Modified" information</button>
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​
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</body>
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</html>
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