如何使这些数组正常运行？

Question

我的+ getRndFromArray没有从正确的数组中获取，而是从“您希望从以下哪种流派？”中从数组中选择任何选项。 问题。 用于此的数组位于代码的开头（代码段中未显示），我有一个

function getRndFromArray(arrayName){                                
return arrayName[Math.floor(Math.random()*arrayName.length)]; 
}   

在代码开头的数组之后

do {
  var strng = prompt(
    "Do you prefer fiction or non fiction books? From here I can choose a genre of book for you to read"
  );
  var fiction = strng.includes("fiction");
  var nonfiction = strng.includes("non fiction");

  if (fiction == true) {
    var strng = prompt(
      "What genre do you prefer from the following? Fantasy, Science Fiction, Romance, Action, Mystery"
    );
    var fantasy = strng.includes("Fantasy");
    var sciencefiction = strng.includes("Science Fiction");
    var romance = strng.includes("Romance");
    var action = strng.includes("Action");
    var mystery = strng.includes("Mystery");
    if (fantasy == true) {
      alert("I think you will enjoy " +getRndFromArray(FantasyArray));
    } else if (sciencefiction == true) {
      alert("I think you will enjoy " +getRndFromArray(ScienceFictionArray));
    } else if (romance == true) {
      alert("I think you will enjoy " +getRndFromArray(RomanceArray));
    } else if (action == true) {
      alert("I think you will enjoy " +getRndFromArray(ActionArray));
    } else mystery == true;
    {
      alert("I think you will enjoy " +getRndFromArray(MysteryArray));
    }
  }

  if (nonfiction == true) {
    var strng = prompt(
      "What genre do you prefer from the following? Self Help, Cooking, Health, Business"
    );
    var selfhelp = strng.includes("Self Help");
    var cooking = strng.includes("Cooking");
    var health = strng.includes("Health");
    var business = strng.includes("Business");
    if (selfhelp == true) {
      alert("I think you will enjoy " +getRndFromArray(SelfHelpArray));
    } else if (cooking == true) {
      alert("I think you will enjoy " +getRndFromArray(CookingArray));
    } else if (health == true) {
      alert("I think you will enjoy " +getRndFromArray(HealthArray));
    } else if (business == true) {
      alert("I think you will enjoy " +getRndFromArray(BusinessArray));
    } //if no option is inputed this set of code will run
    else {
      var again = prompt(
        "You have not told me whether you prefer fiction or non fiction. Would you like to try again? Yes or No?"
      );
    }
  } // prompt relating to do while loop
} while (again === "Yes");
</script>
</body>
</html>

Answer 1

Scott Sauyet发现了错误的位置，但mystery == true; 应该是if (mystery == true)或简单地if (mystery) 。

Answer 2

在这方面的细微变化应该可以帮助您前进。 它仅涉及四种类型。 没有处理类型错误的流派。 但是基本知识就在那里。 主要遗漏的是“神秘案”中的else书写不正确。

您仍然需要解决一个重要问题。 请注意，如果字符串包含“ non fiction”，则它也包含“ fiction”，因此这两个变量均为true。 因此，您仍然需要研究一些测试逻辑。 如果您对此感到困惑，请提出一个单独的问题，说明您的工作，其他人将很乐意为您提供帮助。

 const FantasyArray = ["The Name of the Wind", "A Wise Man's Fear", "A Game of Thrones", "The Hobbit"]; const MysteryArray = ["A Study in Scarlet", "The Sign of the Four", "The Hound of the Baskervilles"]; const CookingArray = ["The Joy of Cooking", "The Moosewood Cookbook", "The Enchanted Broccoli Forest"]; const SelfHelpArray = ["I Do It Myself!", "Freud for Dummies"] function getRndFromArray(arrayName){ return arrayName[Math.floor(Math.random()*arrayName.length)]; } var again; do { var strng = prompt( "Do you prefer fiction or non fiction books? From here I can choose a genre of book for you to read" ); var fiction = strng.includes("fiction"); var nonfiction = strng.includes("non fiction"); if (fiction == true) { var strng = prompt( "What genre do you prefer from the following? Fantasy, Mystery" ); var fantasy = strng.includes("Fantasy"); var mystery = strng.includes("Mystery"); if (fantasy == true) { alert("I think you will enjoy " +getRndFromArray(FantasyArray)); } else if (mystery == true) { alert("I think you will enjoy " +getRndFromArray(MysteryArray)); } else { //if no option is inputed this set of code will run } } if (nonfiction == true) { var strng = prompt( "What genre do you prefer from the following? Self Help, Cooking" ); var selfhelp = strng.includes("Self Help"); var cooking = strng.includes("Cooking"); if (selfhelp == true) { alert("I think you will enjoy " +getRndFromArray(SelfHelpArray)); } else if (cooking == true) { alert("I think you will enjoy " +getRndFromArray(CookingArray)); } else { //if no option is inputed this set of code will run } } else { again = prompt("You have not told me whether you prefer fiction or non fiction. Would you like to try again? Yes or No?") } } while (again === "Yes"); 

对于新来者来说，这是一个合理的问题。 但是代码太多。 请访问帮助中心 ，尤其是如何创建最小的，可复制的示例 。 您可能还想阅读如何创建可运行的堆栈代码段？