javascript - 再次输入后更改文本颜色效果？

Question

我正在为我的网站使用从 codepen 获得的这种打字轮播效果，但是，我需要帮助来修改它。现在，它所做的一切都是在一个单词列表中循环并输入它们。

我想要的效果是每个单独的单词的文本颜色是不同的。话:

• Nerd 。
• 简单。
• 纯 JS。
• 漂亮。
• 有趣!

打出来的时候都是不同的颜色。我怎样才能做到这一点？

Codepen Example

var TxtRotate = function(el, toRotate, period) {
  this.toRotate = toRotate;
  this.el = el;
  this.loopNum = 0;
  this.period = parseInt(period, 10) || 2000;
  this.txt = '';
  this.tick();
  this.isDeleting = false;
};

TxtRotate.prototype.tick = function() {
  var i = this.loopNum % this.toRotate.length;
  var fullTxt = this.toRotate[i];

  if (this.isDeleting) {
    this.txt = fullTxt.substring(0, this.txt.length - 1);
  } else {
    this.txt = fullTxt.substring(0, this.txt.length + 1);
  }

  this.el.innerHTML = '<span class="wrap">' + this.txt + '</span>';

  var that = this;
  var delta = 300 - Math.random() * 100;

  if (this.isDeleting) {
    delta /= 2;
  }

  if (!this.isDeleting && this.txt === fullTxt) {
    delta = this.period;
    this.isDeleting = true;
  } else if (this.isDeleting && this.txt === '') {
    this.isDeleting = false;
    this.loopNum++;
    delta = 500;
  }

  setTimeout(function() {
    that.tick();
  }, delta);
};

window.onload = function() {
  var elements = document.getElementsByClassName('txt-rotate');
  for (var i = 0; i < elements.length; i++) {
    var toRotate = elements[i].getAttribute('data-rotate');
    var period = elements[i].getAttribute('data-period');
    if (toRotate) {
      new TxtRotate(elements[i], JSON.parse(toRotate), period);
    }
  }
  // INJECT CSS
  var css = document.createElement("style");
  css.type = "text/css";
  css.innerHTML = ".txt-rotate > .wrap { border-right: 0.08em solid #666 }";
  document.body.appendChild(css);
};

html,
body {
  font-family: 'Raleway', sans-serif;
  padding: 1em 2em;
  font-size: 18px;
  background: #222;
  color: #aaa
}

h1,
h2 {
  font-weight: 200;
  margin: 0.4em 0;
}

h1 {
  font-size: 3.5em;
}

h2 {
  color: #888;
  font-size: 2em;
}

<link href="https://fonts.googleapis.com/css?family=Raleway:200,100,400" rel="stylesheet" type="text/css" />
<h1>This pen is
  <span class="txt-rotate" data-period="2000" data-rotate='[ "nerdy.", "simple.", "pure JS.", "pretty.", "fun!" ]'></span>
</h1>
<h2>A single &lt;span&gt; is all you need.</h2>

Answer 1

您可以通过定义一组颜色来做到这一点:

var colours = ["red", "green", "blue", "yellow", "orange"]

并在每个循环中设置它:

this.el.innerHTML = '<span class="wrap" style="color: ' + colours[i] + '">'+this.txt+'</span>';

fork 示例:https://codepen.io/mark_c/pen/WEavqy?editors=1010