javascript - 随机发生器总是返回第一个值

Question

我的母亲是一名老师，我决定让她随机挑选学生(二年级)。我的问题是它不断返回一名学生。丹尼尔.我将其设置为将返回的随机数记录到控制台，即使随机数不是 1，它也总是返回 Daniel。这是一个足够简单的任务，至少我是这么认为的。背景信息——有26名学生，她在丹佛任教(人口众多，名字很多奇怪)。

  function studPick() {  
  var random = Math.random() * 100 / 3.84615384615  

  var rand = Math.ceil(random * 1)/1;
  console.log("rand = " + rand + ".");
  if (rand = 1) {
    var student = "Daniel";
  }
  else if (rand = 2) {
    var student = "Judge";
  }
  else if (rand = 3)
  {
    var student = "Jonathan";
  }
  else if (rand = 4) {
    var student = "John";
  }
  else if (rand = 5) {
    var student = "Amethyst";
  }
  else if (rand = 6) {
    var student = "Noah";
  }
  else if (rand = 7) {
    var student = "Antonio";
  }
  else if (rand = 8) {
    var student = "Ramon";
  }
  else if (rand = 9) {
    var student = "Aidan";
  }
  else if (rand = 10) {
    var student = "Manuel";
  }
  else if (rand = 11) {
    var student = "Ingrid";
  }
  else if (rand = 12) {
    var student = "Anastasia";
  }
  else if (rand = 13) {
    var student = "Annabella";
  }
  else if (rand = 14) {
    var student = "Christella";
  }
  else if (rand = 15) {
    var student = "La'Kym";
  }
  else if (rand = 16) {
    var student = "Isabella";
  }
  else if (rand = 17) {
    var student = "Hadiyah";
  }
  else if (rand = 18) {
    var student = "Jersey S";
  }
  else if (rand = 19) {
    var student = "Aviana";
  }
  else if (rand = 20) {
    var student = "Zion";
  }
  else if (rand = 21) {
    var student = "Carlos";
  }
  else if (rand = 22) {
    var student = "Loren";
  }
  else if (rand = 23) {
    var student = "Irie";
  }
  else if (rand = 24) {
    var student = "Trinidad"
  }
  else if (rand = 25) {
    var student = "Jersey W"
  }
  else if (rand = 26) {
    var student = "Stella"
  }
  else {
    alert("An error has occured");
  }
  alert("Randomly picked student: " + student + ".")
}

编辑:我怀疑我的问题是我正在重新定义一个已经定义的变量。我会检查一下，如果这是解决方案，请删除我的问题。

Answer 1

你的第一个错误是在你的意思是==的地方写了=。 rand = 8 表示“使rand 的值为1”；而您想要 rand == 8，“rand 等于 8 吗？”。

不过，如果您使用数组，您的程序会变得更加简单和简短。

var students = ["Daniel", "Judge", "Jonathan"];
var randomStudentIndex = Math.floor(Math.random() * students.length);
var student = students[randomStudentIndex];

(JavaScript 有一个额外的怪癖，即 ===，这在这里并不重要，但稍后可能会咬你的屁股，所以稍后一定要了解其中的区别。实际上，最好使用 === 测试所有内容，而不是 ==，直到您知道为什么要使用 ==。)