一個個刪吧

let obj = {k1:'香蕉', k2:'蘋果', k3:'橘子'};
delete obj.k2;
delete obj.k3;

封裝下

let obj = {k1:'香蕉', k2:'蘋果', k3:'橘子'};
function del(obj, keys) {
    keys.map(function(key) {
        delete obj[key]
    })
    return obj
}
obj = del(obj, ['k2', 'k3'])

封裝一下唄...

let obj = {k1:'香蕉', k2:'蘋果', k3:'橘子'}
function delKey(obj, ...args) {
    args.forEach(v => {
        delete obj[v]
    })
    return obj
}
delKey(obj,'k2','k3')