JavaScript不支持使用局部变量进行闭包吗？

function outerFunction() {
  let count = 0;

  function innerFunction() {
    count++;
    console.log(count);
  }

  return innerFunction;
}

const closureFunction = outerFunction();
closureFunction(); // 输出 1
closureFunction(); // 输出 2

function makeAdder(x) {
  return function(y) {
    return x + y;
  };
}

const add5 = makeAdder(5);
const add10 = makeAdder(10);

console.log(add5(3));  // 输出 8
console.log(add10(3)); // 输出 13