const myURL = new URL('http://www.gilbut.co.kr/?page=3&limit=10&category=nodejs&category=javascript');
console.log('searchParams:', myURL.searchParams);
console.log('searchParams.getAll():', myURL.searchParams.getAll('category'));
console.log('searchParams.get():', myURL.searchParams.get('limit'));
console.log('searchParams.has():', myURL.searchParams.has('page'));

console.log('searchParams.keys():', myURL.searchParams.keys());
console.log('searchParams.values():', myURL.searchParams.values());

myURL.searchParams.append('filter', 'es3');
myURL.searchParams.append('filter', 'es5');
console.log(myURL.searchParams.getAll('filter'));

myURL.searchParams.set('filter', 'es6');
console.log(myURL.searchParams.getAll('filter'));

myURL.searchParams.delete('filter');
console.log(myURL.searchParams.getAll('filter'));

console.log('searchParams.toString():', myURL.searchParams.toString());
myURL.search = myURL.searchParams.toString();

$ node searchParams
searchParams: URLSearchParams {
  'page' => ' 3 ',
  'limit' => ' 10 ',
  'category' => 'nodejs',
  'category' => 'javascript' }
searchParams.getAll(): [ 'nodejs', 'javascript' ]
searchParams.get(): 10
searchParams.has(): true
searchParams.keys(): URLSearchParams Iterator { 'page', 'limit', 'category', 'category' }
searchParams.values(): URLSearchParams Iterator { ' 3 ', ' 10 ', 'nodejs', 'javascript' }
[ 'es 3 ', 'es 5 ' ]
[ 'es 6 ' ]
[]
searchParams.toString(): page=3&limit=10&category=nodejs&category=javascript