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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 Example
		</title>
	</head>
	<body>
		<p>
			This example must be run on a server to work properly.
		</p>
		<script>
			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 {
								new ActiveXObject(versions[i]);
								arguments.callee.activeXString = versions[i];
								break;
							} catch(ex) {
								//skip
							}
						}
					}

return new ActiveXObject(arguments.callee.activeXString);
				} else {
					throw new Error("No XHR object available.");
				}
			}

var xhr = createXHR();
			xhr.open("get", "/upload/files/201702/example.txt", false);
			xhr.send(null);

if ((xhr.status >= 200 && xhr.status < 300) || xhr.status == 304) {
				alert(xhr.statusText);
				alert(xhr.responseText);
			} else {
				alert("Request was unsuccessful: " + xhr.status);
			}
		</script>
	</body>

</html>

​x
 
<!DOCTYPE html>
<html>
    <head>
        <title>
            XHR Example
        </title>
    </head>
    <body>
        <p>
            This example must be run on a server to work properly.
        </p>
        <script>
            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++) {