替换多个字符串的单个JS函数

function replaceMultipleStrings(str, replacements) {
  let result = str;
  for (let key in replacements) {
    if (replacements.hasOwnProperty(key)) {
      result = result.replace(new RegExp(key, 'g'), replacements[key]);
    }
  }
  return result;
}

const originalString = "Hello World! This is a test.";
const replacements = {
  "Hello": "Hi",
  "World": "Universe",
  "test": "example"
};

const newString = replaceMultipleStrings(originalString, replacements);
console.log(newString);
// Output: "Hi Universe! This is a example."