Question

我正在尝试制作一个从数组中选取一个随机字符串的javascript，并且它会这样做，但在输出后它总是说“unidentified”。这不会是一个大问题，除了我试图这样做10-20次这一事实，这使得10-20“身份不明的人”在尝试阅读字符串的过程中受到阻碍。

//Draw random contestants for a game show!

var contestants = ["Alejandro", "Amy", "AnnMaria", "B", "Beardo", "Beth", "Blainley", "Brick", "Bridgette", "Cameron", "Cody", "Courtney", "Dakota", "Dave", "Dawn", "DJ", "Duncan", "Ella", "Eva", "Ezekiel", "Geoff", "Gwen", "Harold", "Heather", "Izzy", "Jasmine", "Jo", "Justin", "Katie", "Leonard", "Leshawna", "Lightning", "Lindsey", "Max", "Mike", "Noah", "Owen", "Rodney", "Sadie", "Sam", "Samey", "Scarlett", "Scott", "Shawn", "Sierra", "Sky", "Staci", "Sugar", "Tofur", "Trent", "Tyler", "Zoey"];

var randomContestant = function () {
  console.log(contestants[Math.floor(Math.random() * 52)]);
};

//randomContestant(); to pick a random contestant.

var drawContestants = function (howMany) {
  for (var i = 0 ; i < howMany; i++) {
    console.log (randomContestant(i + howMany));
  }
};

//drawContestants(numberOfContestantsYouWantDrawn); to draw a number of random contestants.

从我看到的其他问题来看，它与函数的参数是空白的事实有关吗？如果这是问题，我应该把它放在那里让它在输出后停止给出“Unidentified”？

（我现在只做了几天的javascript，所以如果这个问题得到了解答，我要么错过了那个问题，要么因为它更先进而无法理解它们的答案。）

Answer 1

您需要var files = []; Liferay.Service( '/group/get-user-sites-groups', function(obj) { var result; for(var i= 0; i< obj.length; i++) { result = obj[i].groupId; Liferay.Service( '/dlfolder/get-subfolder-ids', { groupId: result, folderId: 0, recurse: true }, function(subIds) { var folders = subIds; folders.unshift(0); for(var i=0; i< folders.length; i++) { Liferay.Service( '/dlapp/get-file-entries', { repositoryId: result, folderId: folders.pop() }, function(object) { if(object.length > 0) { files=files.concat(object); } }); } }); } });该值。您只打印出该值。

return

Answer 2

JavaScript函数默认返回undefined。

您可以尝试重构代码，以便将循环控制日志52次，而不是调用控制台记录52次的函数。

Answer 3

您已将参数传递给randomContestant，但您未在该功能中使用该参数。您也不会因为他们被选中而移除参赛者。尝试这样的事情：

＆＃13;

const contestants = ["Alejandro", "Amy", "AnnMaria", "B", "Beardo", "Beth", "Blainley", "Brick", "Bridgette", "Cameron", "Cody", "Courtney", "Dakota", "Dave", "Dawn", "DJ", "Duncan", "Ella", "Eva", "Ezekiel", "Geoff", "Gwen", "Harold", "Heather", "Izzy", "Jasmine", "Jo", "Justin", "Katie", "Leonard", "Leshawna", "Lightning", "Lindsey", "Max", "Mike", "Noah", "Owen", "Rodney", "Sadie", "Sam", "Samey", "Scarlett", "Scott", "Shawn", "Sierra", "Sky", "Staci", "Sugar", "Tofur", "Trent", "Tyler", "Zoey"];

const randomContestant = function (pool) {
  return pool[Math.floor(Math.random() * pool.length)];
};

const drawContestants = function (howMany) {
  // make a copy so as not to mutate the original array
  let contestantPool = contestants.slice();
  for (let i = 0 ; i < howMany; i++) {
    const pick = randomContestant(contestantPool);
    console.log(pick);
    const index = contestantPool.indexOf(pick);
    contestantPool =
    [...contestantPool.slice(0, index),
     ...contestantPool.slice(index + 1),
    ];
  }
};

drawContestants(10);

＆＃13;

没有参数的函数在输出后给出未识别的

3 个答案: