Detailed explanation of the steps for Jquery to operate js arrays and objects

var WorkList = new Array();//数组对象 
//下面是自己定义的实体 
function WorkEx(depart, title, begintime, endtime) { 
    this.SId = 0; 
    this.Id = -(WorkList.length+1); 
    this.DepartmentName = depart; 
    this.Title = title; 
    this.BeginTime = begintime; 
    this.EndTime = endtime; 
    this.Description = ""; 
    this.Enable = 0; 
    return this; 
} 
function 
Delete
Work(guid) { 
      WorkList = $.grep(WorkList, function (val, key) { 
          return val.Id != guid; 
    }); 
      ShowWork(); 
} 
function ShowWork() { 
    var html = ""; 
    $.each(WorkList, function (key, val) { 
        html = html + " <span class=\"add_work_unit\">" + val.DepartmentName + ":" + val.Title 
            + ",任职时间：" + GetJsDate(val.BeginTime) + "到" + GetJsDate(val.EndTime) + "<a href=\"#\" 
onclick
=&#39;DeleteWork(\"" + val.Id + "\")&#39;>×</a></span>"; 
    }); 
    $("#tdWorkList").html(html); 
} 
function AddWork() { 
    if(CheckIsNull("workaddress","工作地址不能为空") 
        && CheckIsNull("worklevel", "职责不能为空") 
        && CheckIsNull("WorkBegin", "工作开始日期不能为空") 
        && CheckIsNull("WorkLeave", "工作结束日期不能为空") 
        ) 
    { 
        var isok = true; 
        $.each(WorkList, function (key, val) { 
            if (val.DepartmentName == $("#workaddress").val() 
              && val.Title == $("#worklevel").val() 
                && val.BeginTime == $("#WorkBegin").val() 
                 && val.EndTime == $("#WorkLeave").val() 
                ) 
            { 
                alert("存在相同的工作经历。"); isok= false; 
            }  
        }); 
        if (isok){ 
                var onework = new WorkEx($("#workaddress").val(), $("#worklevel").val(), 
                        $("#WorkBegin").val(), $("#WorkLeave").val()) 
                WorkList.push(onework); 
                //  <span class="add_work_unit">四川省乐天区某某制药厂<a href="#">×</a></span> 
                ShowWork(); 
        } 
    } 
}