layui树形组件如何默认展开

效果图

代码如下
将spread字段设置为true即可

data2 = [{
                    title: '早餐'
                    , spread:true
                    , id: 1
                    , children: [{
                        title: '油条'
                        , id: 5
                    }, {
                        title: '包子'
                        , id: 6
                    }, {
                        title: '豆浆'
                        , id: 7
                    }]
                }, {
                    title: '午餐'
                    , spread: true
                    , id: 2
                    , checked: true
                    , children: [{
                        title: '藜蒿炒腊肉'
                        , id: 8
                        , checked: true
                    }, {
                        title: '西湖醋鱼'
                        , id: 9
                        , checked: true
                    }, {
                        title: '小白菜'
                        , id: 10
                        , checked: true
                    }, {
                        title: '海带排骨汤'
                        , id: 11
                        , checked: true
                    }]
                }, {
                    title: '晚餐'
                    , spread: true
                    , id: 3
                    , children: [{
                        title: '红烧肉'
                        , id: 12
                        , fixed: true
                        
                    }, {
                        title: '番茄炒蛋'
                        , id: 13
                        , checked: true
                    }]
                }, {
                    title: '夜宵'
                    , spread: true
                    , id: 4
                    , children: [{
                        title: '小龙虾'
                        , id: 14
                        , checked: true
                    }, {
                        title: '香辣蟹'
                        , id: 15
                        , checked: true
                    }, {
                        title: '烤鱿鱼'
                        , id: 16
                        , checked: true
                    }]
                }];