1. 添加 引用

　　using System.Web.Script.Serialization;

2.

            List<Student> list = new List<Student>();
            list.Add(new Student("张三","男",18));
            list.Add(new Student("李","女",19));
            list.Add(new Student("李", "女", 19));

            context.Response.ContentType = "text/javascript";
            context.Response.Write(new JavaScriptSerializer().Serialize(list));

说明:   Student是一个实体类