Ajax Post method submission data __ajax

<script language= "JavaScript" > <!– function Saveuserinfo () { Get the Accept return information layer var msg = document.getElementById ("msg"); Get form objects and user information values var f = document.user_info; var userName = F.user_name.value; var userage = F.user_age.value; var usersex = F.user_sex.value; Receive the URL address for the form var url = "commit.php"; The value of the post is required to join each variable by & var poststr = "Name=" + userName + "&age=" + userage + "&sex=" + usersex; Instantiating Ajax var ajax = null; if (window. XMLHttpRequest) { Ajax = new XMLHttpRequest (); } else if (window. ActiveXObject) { Ajax = new ActiveXObject ("Microsoft.XMLHTTP"); } else{ Return } To open a connection by post Ajax.open ("POST", url, True); Defines the transmitted file HTTP header information Ajax.setrequestheader ("Content-type", "application/x-www-form-urlencoded"); Send post data Ajax.send (POSTSTR); Returns the processing function of the data Ajax.onreadystatechange = function () { if (ajax.readystate = = 4 && ajax.status = 200) { msg.innerhtml = Ajax.responsetext; } } } –> </SCRIPT> <form name= "User_info" > Name: <input type= "text" name= "user_name"/><br/> Age: <input type= "text" name= "User_age"/><br/> Sex: <input type= "text" name= "User_sex"/><br/> <input type= "button" value= "Submitting form" onclick= "Saveuserinfo ()" > </form> Build a layer that accepts return information: <div id= "MSG" ></div>

Note :
compared to the Get method, the Post method transmits data larger than 2K, and the application in Ajax differs in that: "The Post method's request address and the transmitted data are placed in two objects-the request address is placed in the open object, The transmitted data is placed in the Send object, and a transmission file HTTP header information (setrequestheader) is defined before the data is transmitted (commit.php), which can be $_post[' name '] ,  in the file with the variable $_ post[' age '],    $_post[' sex ' obtains data transmitted by the Send object. and manipulate the database.