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                ## GET 請求 * * *  一個簡單的`GET`請求: ``` <!DOCTYPE html> <html> <head> <meta charset="utf-8"> <script> function loadXMLDoc() { var xmlhttp; if (window.XMLHttpRequest) {// code for IE7+, Firefox, Chrome, Opera, Safari xmlhttp=new XMLHttpRequest(); } else {// code for IE6, IE5 xmlhttp=new ActiveXObject("Microsoft.XMLHTTP"); } xmlhttp.onreadystatechange=function() { if (xmlhttp.readyState==4 && xmlhttp.status==200) { document.getElementById("myDiv").innerHTML=xmlhttp.responseText; } } xmlhttp.open("GET","/statics/demosource/demo_get.php",true); xmlhttp.send(); } </script> </head> <body> <h2>AJAX</h2> <button type="button" onclick="loadXMLDoc()">Request data</button> <div id="myDiv"></div> </body> </html> ``` 在上面的例子中,您可能得到的是緩存的結果。  為了避免這種情況,請向 URL 添加一個唯一的 ID: ``` <!DOCTYPE html> <html> <head> <meta charset="utf-8"> <script> function loadXMLDoc() { var xmlhttp; if (window.XMLHttpRequest) {// code for IE7+, Firefox, Chrome, Opera, Safari xmlhttp=new XMLHttpRequest(); } else {// code for IE6, IE5 xmlhttp=new ActiveXObject("Microsoft.XMLHTTP"); } xmlhttp.onreadystatechange=function() { if (xmlhttp.readyState==4 && xmlhttp.status==200) { document.getElementById("myDiv").innerHTML=xmlhttp.responseText; } } xmlhttp.open("GET","/statics/demosource/demo_get.php?t=" + Math.random(),true); xmlhttp.send(); } </script> </head> <body> <h2>AJAX</h2> <button type="button" onclick="loadXMLDoc()">Request data</button> <p>Click the button several times to see if the time changes, or if the file is cached.</p> <div id="myDiv"></div> </body> </html> ``` 如果您希望通過`GET`方法發送信息,請向 URL 添加信息: ``` <!DOCTYPE html> <html> <head> <meta charset="utf-8"> <script> function loadXMLDoc() { var xmlhttp; if (window.XMLHttpRequest) {// code for IE7+, Firefox, Chrome, Opera, Safari xmlhttp=new XMLHttpRequest(); } else {// code for IE6, IE5 xmlhttp=new ActiveXObject("Microsoft.XMLHTTP"); } xmlhttp.onreadystatechange=function() { if (xmlhttp.readyState==4 && xmlhttp.status==200) { document.getElementById("myDiv").innerHTML=xmlhttp.responseText; } } xmlhttp.open("GET","/statics/demosource/demo_get2.php?fname=Henry&lname=Ford",true); xmlhttp.send(); } </script> </head> <body> <h2>AJAX</h2> <button type="button" onclick="loadXMLDoc()">Request data</button> <div id="myDiv"></div> </body> </html> ``` **提示:**`GET`請求具有以下的幾個特點: * `GET`請求可被緩存 * `GET`請求保留在瀏覽器歷史記錄中 * `GET`請求可被收藏為書簽 * `GET`請求不應在處理敏感數據時使用 * `GET`請求有長度限制 * `GET`請求只應當用于取回數據
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