get_child.js

const data = [ 
    { id: 1, name: '1111', ref: 2 },
    { id: 2, name: '222', ref: 3 },
    { id: 3, name: '3333', ref: 0 }
];

const getOne = (_id) => data.find(item => item.id == _id)

const render = (it) => {
    let text = [it.name]

    if (it.ref > 0) {
        let ref = getOne(it.ref)

        while(ref) {
            text.push(ref.name) 
            ref = getOne(ref.ref)
        }
    }
    
    return text.join('/')
}


data.forEach(it => console.log(render(it)))