如果是get 模式的請求，則將傳遞參數通過URL 地址發送到服務器端；
如果是post 模式的請求，則將傳遞參數通過send( ) 方法發送到服務器端（並且必須設置請求文件頭）；
post 模式的代碼如下：
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<script type="text/javascript"> |
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<!-- |
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var queryString = "firstName=xugang&birthday=1227"; |
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var url = "9-3.aspx?timetamp=" + new Date().getTime(); |
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xmlHttp.open("POST",url); |
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xmlHttp.setRequestHeader("Content-Type","application/x-www-form-urlencoded"); |
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xmlHttp.send(queryString); //該語句負責發送數據 |
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//--> |
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</script> |
一個演示get 模式與post 模式區別的示例：
客戶端（9-3.html）
代碼示例：
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> |
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<html> |
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<head> |
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<title>GET VS. POST</title> |
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<script language="javascript"> |
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var xmlHttp; |
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function createXMLHttpRequest(){ |
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if(window.ActiveXObject) |
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xmlHttp = new ActiveXObject("Microsoft.XMLHttp"); |
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else if(window.XMLHttpRequest) |
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xmlHttp = new XMLHttpRequest(); |
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} |
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function createQueryString(){ |
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var firstName = document.getElementById("firstName").value; |
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var birthday = document.getElementById("birthday").value; |
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var queryString = "firstName=" + firstName + "&birthday=" + birthday; |
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return encodeURI(encodeURI(queryString)); //兩次編碼解決中文亂碼問題 |
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} |
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// GET 模式 |
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function doRequestUsingGET(){ |
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createXMLHttpRequest(); |
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var queryString = "9-3.aspx?"; |
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queryString += createQueryString() + "×tamp=" + new Date().getTime(); |
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xmlHttp.onreadystatechange = handleStateChange; |
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xmlHttp.open("GET",queryString); |
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xmlHttp.send(null); |
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} |
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// POST 模式 |
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function doRequestUsingPOST(){ |
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createXMLHttpRequest(); |
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var url = "9-3.aspx?timestamp=" + new Date().getTime(); |
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var queryString = createQueryString(); |
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xmlHttp.open("POST",url); |
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xmlHttp.onreadystatechange = handleStateChange; |
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xmlHttp.setRequestHeader("Content-Type","application/x-www-form-urlencoded"); |
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xmlHttp.send(queryString); |
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} |
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function handleStateChange(){ |
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if(xmlHttp.readyState == 4 && xmlHttp.status == 200){ |
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var responseDiv = document.getElementById("serverResponse"); |
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responseDiv.innerHTML = decodeURI(xmlHttp.responseText); //解碼 |
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} |
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} |
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</script> |
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</head> |
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|
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<body> |
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<h2>輸入姓名和生日</h2> |
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<form> |
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<input type="text" id="firstName" /><br> |
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<input type="text" id="birthday" /> |
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</form> |
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<form> |
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<input type="button" value="GET" onclick="doRequestUsingGET();" /><br> |
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<input type="button" value="POST" onclick="doRequestUsingPOST();" /> |
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</form> |
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<div id="serverResponse"></div> |
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</body> |
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</html> |
服務器端（9-3.aspx）
代碼示例：
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<%@ Page Language="C#" ContentType="text/html" ResponseEncoding="gb2312" %> |
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<%@ Import Namespace="System.Data" %> |
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<% |
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if(Request.HttpMethod == "POST") |
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Response.Write("POST: " + Request["firstName"] + ", your birthday is " + Request["birthday"]); |
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else if(Request.HttpMethod == "GET") |
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Response.Write("GET: " + Request["firstName"] + ", your birthday is " + Request["birthday"]); |
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%> |
通常在數據不多，並且不敏感的時候，使用get 模式的請求；
而數據量大，或者數據敏感的時候，使用post 模式的請求。
