Using POST method in XMLHTTPRequest(Ajax)

var url = "get_data.php";

var params = "lorem=ipsum&name=binny";

http.open("POST", url, true);

//Send the proper header information along with the request

http.setRequestHeader("Content-type", "application/x-www-form-urlencoded");

http.setRequestHeader("Content-length", params.length);

http.setRequestHeader("Connection", "close");

http.onreadystatechange = function() {//Call a function when the state changes.

if(http.readyState == 4 && http.status == 200) {

alert(http.responseText);

}

}

http.send(params);

注意params中值的编码，用函数encodeURIComponent来编码特殊字符。