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如何使用Css3实现炫酷的打字动画

发布时间:2022-03-01 11:32:48 来源:亿速云 阅读:133 作者:小新 栏目:web开发

这篇文章给大家分享的是有关如何使用Css3实现炫酷的打字动画的内容。小编觉得挺实用的,因此分享给大家做个参考,一起跟随小编过来看看吧。

<!DOCTYPE html>

<html lang="en">

<head>

    <meta charset="UTF-8" />

    <title>Document</title>

    <style type="text/css" media="screen">

        .box {

            width:100%;

            height:500px;

            text-align:center;

            position:relative;

        }

        .container {

            width:80%;

            height:400px;

            border:1px solid red;

            text-align:left;

            margin:0 auto;

        }

        .container span {

            display:inline-block;

            border:1px solid red;

            transition: all 2s;

            transform:translateY(0px) rotate(0deg);

            font-size:14px;

        }

        textarea {

            width:200px;

            resize:none;

            height:20px;

            line-height:20px;

            padding:10px 0px;

            font-size:14px;

            font-weight:400;

        }

        .clone {

            font-size:14px;

            border:1px solid red;

            width:80%;

            height:20px;

            margin:0 auto;

            line-height:20px;

            padding:10px 0px;

            text-align:left;

            visibility:hidden;

        }

        .clone span {

            transition:all 2s;

            position:absolute;

        }

 

    </style>

</head>

<body>

    <div class= "box">

        <div class="container">

 

        </div>

        <div class="clone">

            <span class="inner"></span>

        </div>

        <textarea class="textarea" placeholder="请输入文字"></textarea>

    </div>

</body>

    <script>

    //计算出input输入框的偏移值

    var container = document.querySelector(".container");

    var inner = document.querySelector(".inner");

    var clone = document.querySelector(".clone");

    var textarea = document.querySelector(".textarea");

    var offx = (container.offsetWidth - textarea.offsetWidth-20)/2;

    var offy = (container.offsetHeight + inner.offsetHeight);

 

        //创造一个span标签 需要注入需要注入起始坐标

        function createspan(text,x,y) {

           this.text = text;

           this.x = x;

           this.y = y;

           this.init = {};

        }

        createspan.prototype.render = function() {

            var span = document.createElement("span");

            container.appendChild(span);

            span.style.display = "inline-block";

            span.style.transform = "translateX("+this.x+"px) translateY("+this.y+"px) rotate(720deg)";

            span.style.transition = "all 2s";

            span.innerHTML = this.text;

            this.init = span;

        }

        createspan.prototype.recover = function() {

            var that = this;

            setTimeout(function(){

                that.init.style.transform = "translateX(0px) translateY(0px) rotate(0deg)";

            },10)

        }

        var newtext = "";

        var oldtext = "";

        var x = 0;

        var y = 0;

        var total = "";

        //监听textarea文本框的输入变化情况

        textarea.addEventListener("input",function(){

            var text = "";

            if (inner.offsetWidth >= container.offsetWidth ) {

                offx = (container.offsetWidth - textarea.offsetWidth-20)/2 - textarea.offsetWidth;

            }

            else if (inner.offsetWidth >= textarea.offsetWidth*3) {

                offx = (container.offsetWidth - textarea.offsetWidth-20)/2 - textarea.offsetWidth*3;

            }

             else if (inner.offsetWidth >= textarea.offsetWidth*2) {

                offx = (container.offsetWidth - textarea.offsetWidth-20)/2 - textarea.offsetWidth*2;

            } else if(inner.offsetWidth>=textarea.offsetWidth) {

                offx = (container.offsetWidth - textarea.offsetWidth-20)/2 - textarea.offsetWidth;

            }

 

            //先算文字的变化 两种情况一种是增加一种是减少

            newtext = textarea.value;

            oldtext = inner.innerHTML;

            newtext = newtext.trim();

            //添加字符

            if(newtext.length > oldtext.length) {

                for(var i = 0;i < newtext.length;i++) {

                    if(newtext[i] != oldtext[i]) {

                       text += newtext[i];

                        inner.innerHTML = newtext;

                    }

                }

                total += text;

                // 生成

                    for(var i =0;i < text.length;i++) {

 

                        var a = new createspan(text[i],offx,offy);

                        a.render();

                        a.recover();

                    }

            }

            //删除字符

 

        })

    </script>

</html>

感谢各位的阅读!关于“如何使用Css3实现炫酷的打字动画”这篇文章就分享到这里了,希望以上内容可以对大家有一定的帮助,让大家可以学到更多知识,如果觉得文章不错,可以把它分享出去让更多的人看到吧!

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