<link href='http://cdn.repository.webfont.com/webfonts/nomal/136404/45824/5e69c769f629d80b942dd14c.css' rel='stylesheet' type='text/css' />
<span id="ityped" style="color:#FF99CC;font-family:'DroidSans1f725c3b31214d4','DroidSans1f723370a1214d4';"></span>
<script src="https://unpkg.com/ityped@0.0.5"></script>
<script>
    ityped.init('#ityped', {
        strings:['今日过后，所有的晦暗都留给过往。','凛冬散尽，星河长明。','也愿往后日子，日光温和','山风温柔环抱你，','一觉醒来，又是美好的一日'],
        startDelay: 200,
        loop: true,
		typeSpeed: 450, //打字速度
    	backSpeed: 90 //回退速度
    });
</script>

js部分

var _typeof = "function" == typeof Symbol && "symbol" == typeof Symbol.iterator ?
function(a) {
    return typeof a
}: function(a) {
    return a && "function" == typeof Symbol && a.constructor === Symbol && a !== Symbol.prototype ? "symbol": typeof a
}; !
function(a, b) {
    "function" == typeof define && define.amd ? define([], b) : "object" === ("undefined" == typeof exports ? "undefined": _typeof(exports)) ? module.exports = {
        init: b.init
    }: a.ityped = b
} (this,
function(a) {
    function b(a) {
        var b = a;
        return b.strings = a.strings || ["Put you string here...", "and Enjoy!"],
        b.typeSpeed = a.typeSpeed || 100,
        b.backSpeed = a.backSpeed || 50,
        b.backDelay = a.backDelay || 500,
        b.startDelay = a.startDelay || 500,
        b.showCursor = a.showCursor,
        b.loop = a.loop || !1,
        void 0 === b.showCursor && (b.showCursor = !0),
        b.showCursor && j.insertAdjacentElement("afterend", l),
        void 0 !== b.cursorChar && (l.textContent = b.cursorChar),
        Promise.resolve(b)
    }
    function c(a, c) {
        j = document.querySelector(a),
        b(c).then(function(a) {
            k = a;
            var b = k.strings;
            b.length;
            d(b)
        })
    }
    function d(a) {
        forEach(a,
        function(b, c, d) {
            var e = k.typeSpeed * b.length - 1;
            k.backSpeed < k.typeSpeed ? e -= (k.typeSpeed - k.backSpeed) * b.length: k.typeSpeed - k.backSpeed && (e += (k.backSpeed - k.typeSpeed) * b.length);
            var f = this.async(),
            h = a.length;
            g(j, b, c, h).then(function() {
                setTimeout(function() {
                    f()
                },
                e)
            })
        },
        function() {
            k.loop && d(a)
        })
    }
    function e(a, b) {
        return new Promise(function(c, d) {
            for (var e = function(d) {
                count = 0;
                var e = d,
                g = b.length;
                setTimeout(function(d) {
                    f(a, b.charAt(e)),
                    count++,
                    count === g - 1 && c()
                },
                k.typeSpeed * d)
            },
            g = 0; g < b.length; g++) e(g)
        })
    }
    function f(a, b) {
        a.innerHTML += b
    }
    function g(a, b, c, d) {
        return new Promise(function(f, g) {
            e(a, b).then(function() {
                setTimeout(function() {
                    i(a, b, c, d).then(function() {
                        setTimeout(function() {
                            f()
                        },
                        k.startDelay)
                    })
                },
                k.backDelay)
            })
        })
    }
    function h(a, b, c, d) {
        for (var e = function() {
            var e = f,
            g = c;
            setTimeout(function(f) {
                a.innerHTML = b.substring(0, c - e),
                g--,
                1 === e && d()
            },
            k.backSpeed * f)
        },
        f = c; f > 0; f--) e()
    }
    function i(a, b, c, d) {
        return new Promise(function(e, f) {
            var g = b.length;
            c + 1 === d ? k.loop ? k.loop && h(a, b, g, e) : (void 0 !== k.onFinished && "function" == typeof k.onFinished && k.onFinished(), a.innerHTML = b) : c + 1 !== d && h(a, b, g, e)
        })
    } !
    function(a) {
        a.forEach = function(a, b, c) {
            var d = -1,
            e = a.length >>> 0; !
            function f(g) {
                var h, i = g === !1;
                do++d;
                while (! (d in a) && d !== e);
                return i || d === e ? void(c && c(!i, a)) : (g = b.call({
                    async: function() {
                        return h = !0,
                        f
                    }
                },
                a[d], d, a), void(h || f(g)))
            } ()
        }
    } ("object" == ("undefined" == typeof exports ? "undefined": _typeof(exports)) && exports || a);
    var j = void 0,
    k = void 0,
    l = document.createElement("span");
    return l.classList.add("ityped-cursor"),
    l.textContent = "|",
    {
        init: c
    }
} (this));