仅替换字符串中完全匹配的单词

function replaceWords(inputString, targetWord, replacement) {
  // 使用正则表达式匹配完全相同的单词
  var regex = new RegExp("\\b" + targetWord + "\\b", "g");
  
  // 使用replace()函数替换匹配到的单词
  var result = inputString.replace(regex, replacement);
  
  return result;
}

// 示例用法
var input = "This is a test. Test the replace function.";
var target = "test";
var replacement = "example";

var output = replaceWords(input, target, replacement);
console.log(output);