如何在javascript中使用textarea改写数字 [英] how to shuffle numbers with textarea in javascript

问题描述

如果我将数字这样输入文本区域:

If I put numbers into a textarea like so:

418484
418485
418486

我希望他们被改组，并且我想要这样的输出:

I want them to get shuffled, and I want an output like this:

418485
418484
418486

我不希望更改值-我只想要一些JavaScript或jQuery，它们可以将这些数字改组并在网页上显示结果.

I don't want the values changed - I just want some JavaScript or jQuery that will shuffle these numbers and give me the result in my web page.

推荐答案

我从此答案中发现了一个很棒的随机播放功能:

I found this great shuffle function from this answer:

function shuffle(array) {
  var currentIndex = array.length, temporaryValue, randomIndex;

  // While there remain elements to shuffle...
  while (0 !== currentIndex) {

    // Pick a remaining element...
    randomIndex = Math.floor(Math.random() * currentIndex);
    currentIndex -= 1;

    // And swap it with the current element.
    temporaryValue = array[currentIndex];
    array[currentIndex] = array[randomIndex];
    array[randomIndex] = temporaryValue;
  }

  return array;
}

从那里，您可以简单地获取<textarea>输入的值，并根据换行符对其进行分割:

From there, you can simply get the value of the <textarea>'s input, and split it based on linebreaks:

var numbers = document.getElementById("numberInput").value.split("\n");

或者，如果您喜欢空格:

Or if you prefer spaces:

var numbers = document.getElementById("numberInput").value.split(" ");

然后，将其传递给函数:

Then, just pass it into the function:

var shuffledNumbers = shuffle(numbers);

并通过遍历它们并将其写入文档的方式在页面上显示它们:

And show them on the page by iterating over them and writing them to the document:

shuffledNumbers.forEach(function(currentNumber) {
    document.write(currentNumber + "<br />");
})

然后就可以了！

如果您想在另一个<textarea>中显示改组的数字，则:

If you want to display the shuffled numbers in another <textarea> instead:

var output = document.getElementById("output");
shuffledNumbers.forEach(function(currentNumber) {
    output.innerHTML += currentNumber + "\n";
})

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