如何在每个循环上保存变量的值，以便以后可以使用这些值答案

【问题标题】：How do I save the value of a variable on each loop so I can use those values later如何在每个循环上保存变量的值，以便以后可以使用这些值
【发布时间】：2018-01-26 18:46:52
【问题描述】：

我是一个初学者，所以请原谅我缺乏知识。

我有一个代码执行了几次，变量的值是由用户通过提示给出的。有没有办法在每个循环上存储这个值并在循环结束时显示它。有什么我应该使用的元素吗？

谢谢。

var ran = Math.floor(Math.random() * 60) + 1;
var ngs = 9;
var guess = prompt("what's your guess?");

while (ngs > 0) {
  if (guess < ran) {
    var guess = prompt("nope, that was too low. you have " + ngs + " attempts left. guess again");
    ngs = ngs - 1;
  } else if (guess > ran) {
    var guess = prompt("nope, that was too high. you have " + ngs + " attempts left. guess again.");
    ngs = ngs - 1;
  } else if (guess == ran) {
    alert("gj. you win. your guesses were: ");
  }
}
alert("no more attempts. you lose. your guesses were: ");

我最终需要警报来显示用户所做的猜测。

【问题讨论】：

欢迎来到SO，请分享Minimal, Complete, and Verifiable example
欢迎来到 StackOverflow！当您提出问题时，我们需要的基本信息是：代码（您尝试过的内容）、您尝试执行的操作/遇到的任何错误或问题的说明以及预期结果
推入数组？将其写入字符串？很多选择，一切都取决于结果。也许如果你展示你目前拥有的东西，人们可以更好地帮助你。
它们被称为“变量”。您希望我们推荐一个基本的 javascript 教程吗？
我添加了代码。我知道这是一场灾难，但请与我同在。

标签： javascript loops variables

【解决方案1】：

epascarello 在上面的评论中是正确的。我个人建议将其写入字符串，但推送到数组也可以。

字符串方法

var ran = Math.floor(Math.random() * 60) + 1;
var ngs = 9;
var guess = prompt("what's your guess?");
var guesses = ""

while (ngs > 0) {
  if (guess < ran) {
    var guess = prompt("nope, that was too low. you have " + ngs + " attempts left. guess again");
    ngs = ngs - 1;
    guesses += guess + ' ';
  } else if (guess > ran) {
    var guess = prompt("nope, that was too high. you have " + ngs + " attempts left. guess again.");
    ngs = ngs - 1;
    guesses += guess + ' ';
  } else if (guess == ran) {
    alert("gj. you win. your guesses were: " + guesses);
  }
}
alert("no more attempts. you lose. your guesses were: " + guesses);

数组方法

var ran = Math.floor(Math.random() * 60) + 1;
var ngs = 9;
var guess = prompt("what's your guess?");
var guesses = []

while (ngs > 0) {
  if (guess < ran) {
    var guess = prompt("nope, that was too low. you have " + ngs + " attempts left. guess again");
    ngs = ngs - 1;
    guesses.push(guess);
  } else if (guess > ran) {
    var guess = prompt("nope, that was too high. you have " + ngs + " attempts left. guess again.");
    ngs = ngs - 1;
    guesses.push(guess);
  } else if (guess == ran) {
    alert("gj. you win. your guesses were: " + guesses.join(' '));
  }
}
alert("no more attempts. you lose. your guesses were: " + guesses.join(' '));

【讨论】：

您的示例中嵌入了enter code here，并且您的alert 函数调用缺少右括号。

【解决方案2】：

跳过 if/else 中guess 变量的重新声明。其次，您可以查看以下链接以了解 Array 类的描述。 Javascript Array

【讨论】：

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