您可以为此解决方案使用 lodash 库：

const content = {
    "success": 1,
    "data": [
        {
            "clustername": "c2",
            "monthday": "12/29"
        },
        {
            "clustername": "C3",
            "monthday": "12/29"
        },
        {
            "clustername": "C71",
            "monthday": "12/31"
        },
        {
            "clustername": "C34",
            "monthday": "12/31"
        },
        {
            "clustername": "C998",
            "monthday": "1/4"
        },
        {
            "clustername": "C99",
            "monthday": "1/4"
        }
    ]
};
function customName(n) {
  return {name:n.clustername};
}


const array =  _.chain(content.data)
    .groupBy("monthday")
    .map((value, key) => ({ name: key, children:  _.map(value,v => customName(v))
    }))
    .value()
console.log(array);