Js_Ajax_输入词提示

#suggest {
    background-color: #e0e0e0;
    width: 200px;
}

    var xhr;
    function createXhr() {
        if (window.XMLHttpRequest) {
            xhr = new XMLHttpRequest();
        } else {
            xhr = new ActiveXObject("Microsoft.XMLHTTP");
        }
    }
    
    /* 提示词被选中 */
    function select(divElm){
        var inputElm = document.getElementById("keyword");
        // 选中提示词
        inputElm.value=divElm.innerText;
        // 关闭提示框
        document.getElementById("suggest").innerHTML="";
    }
    /* 输入后提示（输入1，有提示，否则没有） */
    function search() {
        var inputElm = document.getElementById("keyword");
        // 获取输入的内容
        var inputWord = inputElm.value;

        createXhr();
        xhr.onreadystatechange = function cbSearch() {
            if (xhr.readyState == 4 && xhr.status == 200) {
                var rsp = xhr.responseText;
                var json = eval("(" + rsp + ")");

                // 获取提示词组
                var array = json.array;

                var addHtml = "";
                if (array!=null) {
                    // 提示词组不为空，循环取词，添加div
                    for ( var idx in array) {
                        addHtml += "<div onclick=‘select(this)‘>" + array[idx] + "</div>";
                    }
                }
                //提示框 设 提示词
                document.getElementById("suggest").innerHTML = addHtml;
            }
        };
        xhr.open("get", "AjaxServlet?para=" + inputWord, true);
        xhr.send(null);
    }

    <!-- 按键抬起才能取到输入内容，否则(keypress/keydown)是上次输入内容 -->
    <input type="text" id="keyword" onkeyup="search()">
    <br>
    <div id="suggest"></div>

    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
            response.setCharacterEncoding("utf-8");
            AhJson aj = new AhJson();
            String para=request.getParameter("para");

            JSONObject jo = new JSONObject();
            JSONArray a = new JSONArray();
            if ("1".equals(para)){
                a.add("1");
                a.add("163");
                a.add("12306");
                jo.put("array", a);
            }
            response.getWriter().write(jo.toString());

    }