来个小样例,一看就明白!
var ajax = new XMLHttpRequest();
ajax.open('post','http://localhost:8080/kfjs2/user/query');
ajax.setRequestHeader("Content-type","application/x-www-form-urlencoded");
ajax.send('name=admin');
ajax.onreadystatechange = function () {
if (ajax.readyState==4 &&ajax.status==200) {
//成功响应
alert(ajax.responseText);//输出json
}
}