使 javascript 输入轮播循环一次

Question

我已经修改了这段代码，我发现它几乎可以完美地做我想做的事，除了它继续循环。 我希望它只输入“零”，删除，输入“一”然后停止。 我试过在这里修改一些东西，但不能让它工作。

    <span
     class="txt-rotate"
     style="font-size: 72px; font-weight: 500; line-height: 72px; margin-bottom: 20px; color: white;"
     data-period="2000"
     data-rotate='[ "zero.", "one." ]'></span>

<script>
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 #fff }";
  document.body.appendChild(css);
};
</script>

关于如何实现这一目标的任何想法？

Answer 1

使用那个：

TxtRotate.prototype.tick = function() {
  //Don't use modulo, it causes the loop. If there is no full text, you are out of the loop and you don't want to do anything.
  var fullTxt = this.toRotate[this.loopNum];
  if(fullTxt) {
    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) {
      // If you are on the last item of the toRotate array, break the loop before deletion.
      if(this.loopNum >= this.toRotate.length-1) {
        return;
      }
      delta = this.period;
      this.isDeleting = true;
    } else if (this.isDeleting && this.txt === '') {
      this.isDeleting = false;
      this.loopNum++;
      delta = 500;
    }

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

希望这会有所帮助；)