js数组扁平化操作

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let data = [[1,2,3],[1,2,3],[1,2,3]];
let res = [];
data.forEach(item => {
    item.forEach? item.forEach(val =>{res.push(val)}) :res.push(item)
})

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let data = [[1,2,3],[1,2,3],[1,2,3]];
let res = [];

var falt = (res) => {
    if(res.forEach){
        res.forEach(val => {
            val.forEach ? falt(val) : res.push(val)
        })
    }else{
        res.push(res)
    }
}

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    function flatten(arr, result = []) {
          for (let item of arr) {
            if (Array.isArray(item.children))
              flatten(item.children, result)
            else
              result.push(item)
          }
          return result
    }