easyui中表格初始化 //alert(value)

  {
                field : "attachList",
                title : "附件",
                width : 250,
                align : "center",
                halign : "center",
                fixed:true,
                 formatter : function(value,row,index){
                    // alert(row);
                    // alert(row.id);
                     return '<a href="#" onclick="dzglxx.main.download(\''+row.id+'\')" >'+value+'</a>';
                } 
            }

        alert(value)显示 undefined！。实体类中attachList对象跟field应该是对应的！
        实体类

@ManyToMany(fetch = FetchType.LAZY, targetEntity = AttachmentEntity.class)
@JoinTable(name = "T_SYS_ATTACHMENT", joinColumns = { @JoinColumn(name = "entity_id") }, inverseJoinColumns = { @JoinColumn(name = "id") })
public List<AttachmentEntity> getAttachList() {
    return attachList;
}

public void setAttachList(List<AttachmentEntity> attachList) {
    this.attachList = attachList;
}

自己看客户端得到的内容，肯定是没有attachList属性才是undefined，你要得到类型下面的数据才对

 {"rows":[{"attachList":"xxxxxxx"......},{"attachList":"xxxxxxx"......}...........]

你的datagrid匹配到你返回的字段为attachList的数据么？能匹配才有value，才能对其进行formatter

后台返回的字段肯定没有attachList属性，建议把返回的整条数据打印出来，对比一下