Ask the next array traversal problem js

the result I want to traverse is a table list. The problem now is that all the data has only been traversed in one row. I want to traverse multiple rows, each row traversing four pieces of data to show. What should I do

render() {
    const data = [{"":"a1","":"0026"},{"":"a2","":"0026"},{"":"a3","":"0026"},{"":"a4","":"0026"},{"":"a5","":"0026"},{"":"a6","":"0026"},{"":"a7","":"0026"},{"":"a8","":"0026"},{"":"a9","":"0026"},...];
    return (
      <div className="result">
        <div>
            {
              data.map((item,index) =>
                <div>
                  

{item[""]}

{item[""]}

</div> ) } </div> </div> ); }

Mar.07,2021


ps: key

[
    // 
    [{
      '':'a1','':'0026'
    },{
      '':'a1','':'0026'
    },
      '':'a1','':'0026'
    },{
      '':'a1','':'0026'
    }],
    // 
    [],
    ...
]
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