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<!DOCTYPE html> <html> <body> <h2>XMLHttpRequest 对象</h2> <p>getAllResponseHeaders() 函数返回资源的所有头信息，如长度、服务器类型、内容类型、最后修改时间等：</p> <p id="demo"></p> <script> var xhttp = new XMLHttpRequest(); xhttp.onreadystatechange = function() { if (this.readyState == 4 && this.status == 200) { document.getElementById("demo").innerHTML = this.getAllResponseHeaders(); } }; xhttp.open("GET", "ajax_info.txt", true); xhttp.send(); </script> </body> </html>