Javascript只允许一个if语句，而if / else则不允许

Question

我试图使用if，else if，else语句，但是一旦我添加了else if，它似乎无法工作。如果我只使用if语句，一切正常，但是一旦我添加了else if，否则它就会停止工作。

var portAnswer = "";
var strQuestion = "Did you make it to port on time?";
var strDefault = "Yes/No";
portAnswer = prompt(strQuestion, strDefault);

var strMessage;

$(document).ready(function() {
  if (portAnswer == "yes") {
    strMessage = "Arghh, you are awarded extra doubloons!";
  } else if (portAnswer == "no") {
    strMessage = "Arggh, walk that there plank!");
  } else {
    strMessage = "Arggh, I don't understand!");
  }

  var strOutput = document.getElementById("promptParagraph");
  strOutput.textContent = strMessage;
});

Answer 1

删除在JavaScript控制台中显示为错误的额外结束括号：

  if (portAnswer == "yes") {
    strMessage = "Arghh, you are awarded extra doubloons!";
  } else if (portAnswer == "no") {
    strMessage = "Arggh, walk that there plank!";
  } else {
    strMessage = "Arggh, I don't understand!";
  }