js判断超时

    function initAjax() { 
            jQuery.ajaxSetup({ 
                timeout: 10000, 
                            cache: false 
            }); 
            $(document.body).ajaxComplete(function(event, request, ajaxOption, state){ 
                       if(!Comm.browser.isIE  && state == "timeout"){ 
                              Comm.onceError("请求超时,请稍候重试!"); 
                       } 
                    }).ajaxError(function(event, request, ajaxOption,  thrownError){ 
                        var passError = /&passerror=|^passerror=/; 
                        var hasJsonName = /&jsonName=|^jsonName=/; 
                        var data = ajaxOption.data; 
                        var isJsonRPC = data && hasJsonName.test(data) && (!passError.test(data)); 
                        try{ 
                                if(!Comm.browser.isIE && (!request || request.status == 0)){ 
                                        Comm.onceError("网络连接中断,请检查你的网络连接"); 
                                        return; 
                                } 
                                var state_code = request.status.toString().substr(0, 3); 
                                if (state_code != "200") { 
                                        var msg = ''; 
                                        msg = $HTTP_STATE_CODE[state_code]; 
                                        if(msg) msg = msg[1] || msg[0]; 
                                        if (!msg) msg = "请求数据失败，请稍后重试"; 
                                        if (state_code == "401") Comm.error(msg, function() { 
                                                top.location.href = "http://www.a.com/login"; 
                                                        return; 
                                                }); 
                                        if (isJsonRPC) Comm.error(msg); 
                                } 
                        }catch(e){ 
                                if(Comm.browser.isIE)Comm.onceError("请求超时,请稍候重试!"); 
                        } 
                }) 
        }