//有如下数组，里面包含路由数据
const routes = [

{
    path:'/a',
    children:[
        {
            path:'a-1',
            children:[
                {
                       path:'a-1-1',
                       children:[]
                },
                {
                       path:'a-1-2',
                       children:[]
                },
                {
                       path:'a-1-3',
                       children:[]
                },
            ]
        },
        {
            path:'a-2',
            children:[
                {
                    path:'a-2-1'
                }
            ]
        }
    ]
},
{
    path:'/b',
    children:[
        {
            path:'b-1'
        },
        {
            path:'b-2'
        }
    ]
}

]

//想处理后能输出
//[
// "/a/a-1/a-1-1",
// "/a/a-1/a-1-2",
// "/a/a-1/a-1-3",
// "/a/a-2/a-2-1",
// "/b/b-1",
// "/b/b-2"
// ]

//以下代码只能输出
//["/a/a-1/a-1-1,a-1-2,a-1-3,a-2/a-2-1", "/b/b-1,b-2"]

function gen(menu){

let tmp=[]
for(item of menu){
    if(item.children && item.children.length>0){
        tmp.push(item.path+'/'+gen(item.children))
    }else{
        tmp.push(item.path)
    }
}
return tmp

}

let m=gen(routes)
console.log(m)