function btn_get_click(){

          var httpRequest = new XMLHttpRequest();

        httpRequest.onreadystatechange = handleResponse;

       // httpRequest.open("GET", "/user/login?user_name=" + encodeURIComponent(username) + "&password=" +

       //         encodeURIComponent(password));

        httpRequest.open("GET", "/course/schedule?termno=0&week=0");

        httpRequest.send(null);

    }

    function handleResponse(e) {

        if (e.target.readyState == XMLHttpRequest.DONE){

            document.getElementById("result").innerHTML = e.target.responseText;

            var responseTextJson = JSON.parse(e.target.responseText);

            alert(responseTextJson.length);

            alert(responseTextJson[0].classroom);

          //  alert(responseTextJson.DATAINFO[0].PROJ_NAME);

        }

    }

function clickLoin() {

            var yonghu = document.getElementById("username").value;//获取用户名

            var mima = document.getElementById("password").value;//获取密码

            var httpRequest = new XMLHttpRequest();

            httpRequest.onreadystatechange = handleResponse;

            var getloin ="username="+yonghu+"&&password="+mima;

            httpRequest.open("post", "/login");

            //以下这句在POST时要加上

            httpRequest.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");

            httpRequest.send(getloin);

        }

        function handleResponse(e) {

            if (e.target.readyState == XMLHttpRequest.DONE){

               // var responseTextJson = JSON.parse(e.target.responseText);

                alert(e.target.responseText);

            }

        }