let arr = ["刘备","关羽","张飞","赵云","马超","黄忠"];
let obj = {};
// 将数组转化为对象
for (let key in arr) {obj[key] = arr[key];};newObj = Object.keys(obj).map(val => ({label: obj[val],value: obj[val]}));
console.log(newObj)

效果如下：label，value可根据具体需求修改