编辑代码

function numToPercent (num) {
    const obj = {
        num,
    }
    Object.defineProperty(obj, 'num', {
        configurable: true,
        enumerable: true,
        set (val) {
            num = val;
        },
        get () {
            return num + '%';
        }
    })
    return obj;
}

const obj = numToPercent(1);
console.log(obj);
console.log(obj.num);
obj.num = 10;
console.log(obj.num);