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JS 实现动态打字效果 - js 笔记

最后更新于
本页目录3 节

打字特效算是一种比较常用的 JS 特效了，一起来看看他们是怎么实现的吧。

只打印单纯的文字(1)

原网页中的可执行演示已停用，以下完整保留为静态 HTML 代码。

<div id="text">


</div>
<script>
  let divTyping = document.getElementById('text')
  let i = 0,
    timer = 0,
    str = '用JS实现动态打字效果，刷新本页面重复'


  function typing () {
    if (i <= str.length) {
      divTyping.innerHTML = str.slice(0, i++) + '_'
      timer = setTimeout(typing, 200)
    }
    else {
      divTyping.innerHTML = str//结束打字,移除 _ 光标
      clearTimeout(timer)
    }
  }


  typing()
</script>

打印带标签的段落(2)

无

纯 JS 自动打字特效(3)

原网页中的可执行演示已停用，以下完整保留为静态 HTML 代码。

<!--复制开始-->
<!--
  版本：1.0
  整理：Muze
  帮助：https://www.npc.ink/15555.html
-->




<h1>Npcink
  <span class="txt-rotate" data-period="2000" data-rotate="[ &quot;提供优秀的wordpress主题、插件&quot;, &quot;提供优秀的Typecho主题、插件&quot;, &quot;促进国内wordpress发展&quot;, &quot;促进小白站长快速成长&quot;, &quot;助力国内互联网进步&quot; ]"></span>
</h1>


<script type="text/javascript">
  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 }";  //光标样式
  document.body.appendChild(css);
};
</script>




<!--复制到此为止-->

想看源代码的自行 F12