按你的方式改變?cè)瓟?shù)組

result.forEach(function (v) {
    v.cfr_date.forEach(function (v2, i) {
        if (i==v.cfr_date.length-1) {
            v.cfr_date = v2;
        } else {
            var { ...c } = v;
            c.cfr_date = v2;
            result.push(c)
        }
    })
})

新數(shù)組

var new_result = result.reduce((arr, v) =>
    v.cfr_date.reduce(function (arr2, v2) {
        var { ...c } = v;
        c.cfr_date = v2;
        arr2.push(c)
        return arr2;
    }, arr)
, [])

let newArr=[];
  result.forEach(meetings=>{
       meetings.meeting_date.forEach(date=>{
       newArr.push({name:meetings.name,age:meetings.age,meeting_date:date});
           });
       });