SOURCE

function omit(obj, arr){
    obj1 = {...obj};
 for(let i in obj1) {
   if(arr.includes(obj1[i])) {
       delete obj1[i];
   }
   }
    return obj1;
}

obj = {
    key1:"nihao",
    key2:"fs",
    key3:"hello"
};
arr = ["hello", "fs"];
w = omit(obj, arr);
for(let i in w) {
    console.log(w[i])
}