Ajax与Servlet问题
XMLHttp.responseText.trim()=="false":由于出现错误 c00ce56e 而导致此项操作无法完成。

JavaScript代码

HTML code

<script type = "text/javascript" charset="utf-8">        var XMLHttp ;        function createXMLHttpRequest(){            if(window.ActiveObject){                XMLHttp= new ActiveObject("Microsoft.XMLHTTP");            }else if(window.XMLHttpRequest) {                XMLHttp = new XMLHttpRequest();            }        }        function checkUserName(){            createXMLHttpRequest();            var name = document.getElementById("uname").value;            if(name==""){                alert("用户名不能为空");                return;            }                XMLHttp.open("get","findName?uname="+name,true);                XMLHttp.onreadystatechange=processRequest;                XMLHttp.send(null);                    }        function processRequest(){            if(XMLHttp.readyState==4){                if(XMLHttp.status==200){                    if(XMLHttp.responseText.trim()=="false"){                        alert("存在");                    }                    else if(XMLHttp.responseText.trim()=="true"){                        alert("可用");                    }                }            }        }        </script>

Servlet代码

Java code

public class findName extends HttpServlet {    public void doGet(HttpServletRequest request, HttpServletResponse response)            throws ServletException, IOException {        response.setContentType("text/html;charset = gbk");        request.setCharacterEncoding("GBK");        PrintWriter out = response.getWriter();        String name = request.getParameter("uname");        UserInfoBiz ubiz = new UserInfoBizImpl();        int number = ubiz.getUsersByName(name);        if(number>0){            out.print(false);        }        else{            out.print(true);        }        out.flush();        out.close();    }    public void doPost(HttpServletRequest request, HttpServletResponse response)            throws ServletException, IOException {        this.doGet(request, response);    }}

[解决办法]
看着没什么问题啊
<script type = "text/javascript" charset="utf-8">
会不会是字符编码问题啊
[解决办法]
js的字符串对象没有trim方法，你自己扩展过string对象原型了？

JScript code

String.prototype.trim = function () { return this.replace(/^\s*|\s*$/g, ''); }