function uuwatchAjax(object,url,async,callback){
    var returnVal;
    $.ajax({  
        type:"POST",  
        url: url,  
        data: JSON.stringify(object),
        dataType:"JSON",  
        async:(async==undefined) ? true : async,
        contentType: "application/json",
        success: function(data, textStatus){  
            returnVal = data;  
            //回调函数
            if(callback && callback instanceof Function){ 
                callback(data);
            }
        },  
        error: function(res){  
            
        } 
    });   
    return returnVal;
}