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实例代码“Ctrl+/”提示“F11/ESC”全屏返回格式化恢复运行

<!DOCTYPE html>
<html>
<head>
    <title>XHR Request Headers Example</title>
</head>
<body>
    <p>This example must be run on a server to work properly.</p>
    <script type="text/javascript">
    
        function createXHR(){
            if (typeof XMLHttpRequest != "undefined"){
                return new XMLHttpRequest();
            } else if (typeof ActiveXObject != "undefined"){
                if (typeof arguments.callee.activeXString != "string"){
                    var versions = ["MSXML2.XMLHttp.6.0", "MSXML2.XMLHttp.3.0",
                                    "MSXML2.XMLHttp"],
                        i, len;
            
                    for (i=0,len=versions.length; i < len; i++){
                        try {
                            var xhr = new ActiveXObject(versions[i]);
                            arguments.callee.activeXString = versions[i];
                            return xhr;
                        } catch (ex){
                            //skip
                        }
                    }
                }
            
                return new ActiveXObject(arguments.callee.activeXString);
            } else {
                throw new Error("No XHR object available.");
            }
        }
        
        var xhr = createXHR();        
        xhr.onreadystatechange = function(){
            if (xhr.readyState == 4){
                if ((xhr.status >= 200 && xhr.status < 300) || xhr.status == 304){
                    alert(xhr.responseText);
                } else {
                    alert("Request was unsuccessful: " + xhr.status);
                }
            }
        };
        xhr.open("get", "/upload/files/201702/example.php", true);
        xhr.setRequestHeader("MyHeader", "MyValue");
        xhr.send(null);

</script>
</body>
</html>

​x
 
<!DOCTYPE html>
<html>
<head>
    <title>XHR Request Headers Example</title>
</head>
<body>
    <p>This example must be run on a server to work properly.</p>
    <script type="text/javascript">
    
        function createXHR(){
            if (typeof XMLHttpRequest != "undefined"){
                return new XMLHttpRequest();
            } else if (typeof ActiveXObject != "undefined"){
                if (typeof arguments.callee.activeXString != "string"){
                    var versions = ["MSXML2.XMLHttp.6.0", "MSXML2.XMLHttp.3.0",
                                    "MSXML2.XMLHttp"],
                        i, len;
            
                    for (i=0,len=versions.length; i < len; i++){
                        try {
                            var xhr = new ActiveXObject(versions[i]);
                            arguments.callee.activeXString = versions[i];