發一個簡單案例：
前台：
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <title>使用者登入</title> <script type="text/javascript" src="../js/jquery-easyui-1.3.5/jquery.min.js"></script> <script type="text/javascript" src="../js/jquery-easyui-1.3.5/jquery.easyui.min.js"></script> <link rel="stylesheet" href="../js/jquery-easyui-1.3.5/themes/default/easyui.css" type="text/css"></link> <link rel="stylesheet" href="../js/jquery-easyui-1.3.5/themes/icon.css" type="text/css"></link> <script type="text/javascript" src="../js/jquery-easyui-1.3.5/locale/easyui-lang-zh_CN.js"></script> <meta http-equiv="content-type" content="text/html;charset=UTF-8" /> <script type = "text/javascript" charset = "UTF-8"> $(function(){ var loginDialog; loginDialog = $('#loginDialog').dialog({ closable : false , // 組件添加屬性：讓關閉按鈕消失 //modal : true, //模式化視窗 buttons : [{ text:'註冊', handler:function(){ } }, { text:'登入', handler:function(){ $.ajax({ url:'../servlet/Login_Do', data :{ name:$('#loginForm input[name=name]').val(), password:$('#loginForm input[name=password]').val() }, dataType:'json', success:function(r){ //var dataObj=eval("("+data+")"); alert("進來了"); }, error:function(){ alert("失敗"); } }); //alert(data) } }] }); }); </script> </head> <body style=”width:100%;height:100%;" > <div id = "loginDialog" title = "使用者登入" style = "width:250px;height:250px;" > <form id = "loginForm" method = "post"> <table> <tr> <th>使用者名稱 :</th> <td><input type = "text" class = "easyui-validatebox" data-options="required:true" name = "name"><br></td> </tr> <tr> <th>密碼: </th> <td> <input type = "password" class = "easyui-validatebox" data-options="required:true" name = "password"><br></td></td> </tr> </table> </form> </div> </body> </html>
後台：
public class Login_Do extends HttpServlet { public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { this.doPost(request, response); } public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { request.setCharacterEncoding("UTF-8"); response.setCharacterEncoding("UTF-8"); String name =request.getParameter("name"); String password = request.getParameter("password"); String js = "{\"name\":name,\"password\":password}"; PrintWriter out = response.getWriter(); JSONObject json = new JSONObject(); json.put("name",name); out.print(json.toString()); response.getWriter().write(json.toString()); } }
點擊登入時：
解決辦法：彈出error資訊一般有兩種可能：
第一種：url錯誤，後台直接得不到值
可以用Firefox的firebug查看：如果響應了資訊，則不是這個問題，那麼就有可能是第二種情況：
返回資料類型錯誤：
在我這個例子中，返回的資料無意中列印了兩次,這兩句刪去一句就好了：
out.print(json.toString()); response.getWriter().write(json.toString());
造成了錯誤。這時在firebug顯示的資訊是：
以上就是為大家分析的用ajax返回驗證的時候總是彈出error的原因，希望對大家解決此類問題有所協助。
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