underscore.js 数组拆分新问题

Question

var message  =message: 
                        [  {n:"jerry",a:"static/images/liuyan.jpg",from:"1", to: "10",msg:"在吗555",date:"2010-12-23"},
                           {n:"jerry",a:"static/images/liuyan.jpg",from:"1", to: "10",msg:"回来了吗",date:"2019-12-23"},
                           {n:"刘云",a:"static/images/ly.jpg",from:"10", to: "1",msg:"回来了:)",date:"2019-12-3"},
                           {n:"刘云",a:"static/images/ly.jpg",from:"10", to: "1",msg:"给你带了东西",date:"2019-12-23"},
                           {n:"刘云",a:"static/images/ly.jpg",from:'10', to: "1",msg:"累死了",date:"2012-1-1"},
                           {n:"jerry",a:"static/images/liuyan.jpg",from:"1", to: "10",msg:"在吗555bbbbbb",date:"2010-12-23"},
                           {n:"刘云",a:"static/images/ly.jpg",from:'10', to: "1",msg:"累死了333333",date:"2012-1-1"},

                        ];

拆分为：

 var message  =message: 
                        [  [{n:"jerry",a:"static/images/liuyan.jpg",from:"1", to: "10",msg:"在吗555",date:"2010-12-23"},
                           {n:"jerry",a:"static/images/liuyan.jpg",from:"1", to: "10",msg:"回来了吗",date:"2019-12-23"}],

                           [{n:"刘云",a:"static/images/ly.jpg",from:"10", to: "1",msg:"回来了:)",date:"2019-12-3"},
                            {n:"刘云",a:"static/images/ly.jpg",from:"10", to: "1",msg:"给你带了东西",date:"2019-12-23"},
                            {n:"刘云",a:"static/images/ly.jpg",from:'10', to: "1",msg:"累死了",date:"2012-1-1"}],

                           
                           [{n:"jerry",a:"static/images/liuyan.jpg",from:"1", to: "10",msg:"在吗555bbbbbb",date:"2010-12-23"}],
                           [{n:"刘云",a:"static/images/ly.jpg",from:'10', to: "1",msg:"累死了333333",date:"2012-1-1"}]

                        ];

每次收到对方的新消息，需要另起一行，如果一直是自己说话，内容还在这行里面。
如何用underscore 实现。