使字符串居中显示在问候语上

function centerAlignString(greeting, containerWidth) {
  const stringLength = greeting.length;
  const spaces = Math.floor((containerWidth - stringLength) / 2);
  const centeredString = ' '.repeat(spaces) + greeting + ' '.repeat(spaces);
  return centeredString;
}

const greeting = 'Hello, World!';
const containerWidth = 20;
const centeredGreeting = centerAlignString(greeting, containerWidth);
console.log(centeredGreeting);