javascript - 如何将 setTimeout 添加到这种类型的动画中？

Question

我不是 JavaScript 开发者。我知道足够的复制、粘贴和修改。但我无法充分理解这个脚本来添加 setTimeout，脱离 W3 示例。

这是我用于文本类型动画的脚本。我想将函数延迟几毫秒。我怎样才能做到这一点？

<script type="text/javascript">
var TxtType = function(el, toRotate, period) {
    this.toRotate = toRotate;
    this.el = el;
    this.loopNum = 0;
    this.period = parseInt(period, 8) || 200;
    this.txt = '';
    this.tick();
    this.isDeleting = false;
};

TxtType.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 - 2.5);
    } else {
    this.txt = fullTxt.substring(0, this.txt.length + 1);
    }

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

    var that = this;
    var delta = 122 - Math.random() * 110;

    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 = 900;
    }

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

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

Answer 1

要使用 setTimeout 延迟函数，您需要执行以下操作:

var myFunction = function() {
    // awesome stuff
};

setTimeout(myFunction, 1000);

这将在 1000 毫秒过去后运行 myFunction。

您还可以将要匿名延迟的函数定义为 setTimeout 的第一个参数，如下所示:

setTimeout(function() {
    // awesome stuff
}, 1000);

这两个使用setTimeout的版本是相同的。