/**
 * 公共方法类
 *
 * 使用  变量名=function()定义函数时，如果在变量名前加var，则这个变量变成局部变量
 */
var Common = function() {
    
    /*
     * 获取url参数
     */
    var getQueryStr = function(sUrlParam, sArgName) {
        var retval = "";
        if (sUrlParam == null || sUrlParam.length == 0) {
            return retval;
        }
        var args = sUrlParam.split("&");
        for (var i = 0; i < args.length; i++) {
            sUrlParam = args[i];
            var arg = sUrlParam.split("=");
            if (arg.length <= 1)
                continue;
            if (arg[0] == sArgName)
                retval = arg[1];
        }
        return retval;
    }
    
    /*
     * ajax发送post请求
     */
    var postReq = function(url, param, fnCallback, isIndex) {
        var target, options = {
            title : "异常信息",
            content : "",
            bodyType : "errorMessage"
        };
        
        if (isIndex) {
            target = window;
        }
        else {
            target = window.parent;
        }
        
       $.ajax({
                url : url,
                type : "POST",
                timeout : 300000,
                headers:"Access-Control-Allow-Origin:*",
                contentType : "application/x-www-form-urlencoded;charset=UTF-8",
                dataType : "json",
                data : param
            }).done(function(data, textStatus, jqXHR) {
                if (jqXHR.getResponseHeader('sessionStatus') == 'timeout') {
                    options.content = '会话已经超时.';
                    target.showModal(options, function() {
                            target.location.href = 'login.html';
                        });
                }
                else if (!data) {
                    options.content = '无返回信息.';
                    target.showModal(options, function() {
                            // donothing
                        });
                }
                else {
                    fnCallback(data);
                }
            }).fail(function(jqXHR, textStatus, errorThrown) {
                if (jqXHR.status == 0) {
                    options.content = '请求异常，网络连接失败！';
                }
                else if (jqXHR.status == 403) {
                    options.content = jqXHR.responseJSON.message;
                }
                else {
                    options.content = "请求异常，状态码：" + jqXHR.status;
                }
                
                target.showModal(options, function() {
                        // donothing
                    });
            });
    };
    
    var postReq = function(url, param, fnCallback, isIndex) {
        var target, options = {
            title : "异常信息",
            content : "",
            bodyType : "errorMessage"
        };
        
        if (isIndex) {
            target = window;
        }
        else {
            target = window.parent;
        }
        
       $.ajax({
                url : url,
                type : "POST",
                timeout : 300000,
                contentType : "application/x-www-form-urlencoded;charset=UTF-8",
                dataType : "json",
                data : param
            }).done(function(data, textStatus, jqXHR) {
                if (jqXHR.getResponseHeader('sessionStatus') == 'timeout') {
                    options.content = '会话已经超时.';
                    target.showModal(options, function() {
                            target.location.href = 'login.html';
                        });
                }
                else if (!data) {
                    options.content = '无返回信息.';
                    target.showModal(options, function() {
                            // donothing
                        });
                }
                else {
                    fnCallback(data);
                }
            }).fail(function(jqXHR, textStatus, errorThrown) {
                if (jqXHR.status == 0) {
                    options.content = '请求异常，网络连接失败！';
                }
                else if (jqXHR.status == 403) {
                    options.content = jqXHR.responseJSON.message;
                }
                else {
                    options.content = "请求异常，状态码：" + jqXHR.status;
                }
                
                target.showModal(options, function() {
                        // donothing
                    });
            });
    };
    
    return {
        getQueryStr : getQueryStr,
        postReq : postReq
    }
}();

调用方法：

                    Common.postReq('svcinfo/findForSelect.do', {
                            svcAlias : key
                        }, function(json) {
                            if ($.trim(key) == '') {
                                // splice(a1,a2,a3...)从a1位置开始替换a2个元素为a3...
                                json.data.splice(0, 0, {
                                        svnName : 'all',
                                        svcAlias : '所有服务'
                                    });
                            }
                            me.cacheDataSource = [];//清空原数组，避免内存泄露
                            me.cacheDataSource[key] = json.data;
                            query.callback({
                                    results : json.data
                                });
                        });