以前要达到类似在电脑上打字的效果，需要 js+html。今天我将介绍一种新方法。本文主要介绍纯 html+css 实现打字效果，有一定的参考价值，大家可以学习一下。提供所有代码，可以直接使用。
一、原理分析
可以将动画看做三个不同的层次：
- 最底层的文字
- 中间挡住文字的背景
- 最上层的光标
文字是静止的，而中间的背景和最上层的光标是动态的。
初始时，背景挡住所有的文字，光标在最左边。
动画进行时，背景和光标以相同的步伐从左往右移动。
动画结束时，背景不再遮挡文字，光标则在最右边闪烁。
这种实现唯一的好处是不需要 js，但缺点是只能用于一行文本，多行文本理论上可以实现，但是比较麻烦。
代码
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Typing effect without js</title>
<style>
:root {
/* number of characters */
--steps: 345;
/* animation time */
--duration: 2.5s;
--fontSize: 50px;
--cursorSize: 20px;
}
.text {
color: #333;;
position: relative;
display: inline-block;
font-family: 'Courier New', Courier, monospace;
font-size: var(--fontSize);
line-height: 1;
}
.text::after {
content: '';
width: var(--cursorSize);
height: var(--fontSize);
background-color: black;
z-index: 2;
position: absolute;
animation: blink 1s var(--duration) step-end infinite,
moveCursor var(--duration) steps(var(--steps)) forwards;
}
.text::before {
content: '';
width: 100%;
height: var(--fontSize);
z-index: 1;
position: absolute;
background: linear-gradient(#fff, #fff) no-repeat top right;
animation: showText var(--duration) steps(var(--steps)) forwards;
}
/* Cursor blink animation */
@keyframes blink {
0% {
background-color: black;
}
50% {
background-color: transparent;
}
100% {
background-color: black;
}
}
/* Cursor movement animation */
@keyframes moveCursor {
0% {
left: 0%;
}
100% {
left: 100%;
}
}
/* background moving animation */
@keyframes showText {
0% {
background-size: 100% 100%;
}
100% {
background-size: 0% 100%;
}
}
</style>
</head>
<body>
<div class="text">hello,world!</div>
</body>
</htm>
二、javascript 实现打字效果 1
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Typing effect with js</title>
</head>
<body>
<div style="font-size: 36px;" id="text">hello,world!</div>
<script>
var str = 'In the past, to achieve an effect similar to typing on a computer,js+html was required. Today I will introduce a new method.';
var i = 0;
function typing(){
var divTyping = document.getElementById('text');
if (i <= str.length) {
divTyping.innerHTML = str.slice(0, i++) + '_';
setTimeout('typing()', 200);
}
else{
divTyping.innerHTML = str;
}
}
typing();
</script>
</body>
</html>
三、javascript 实现打字效果 2
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Typing effect with js</title>
<style>
.divcss5{word-wrap:break-word;font-size: 36px;}
</style>
</head>
<body>
<div class="divcss5" id="aa">
In the past, to achieve an effect similar to typing on a computer, js+html was required. Today I will introduce a new method.This article mainly
</div>
<div style="display:none" id="w">
In the past, to achieve an effect similar to typing on a computer, js+html was required. Today I will introduce a new method.This article mainly introduces pure html+css to achieve typing effect, which has certain reference value, you can learn about it. Provide all the code, you can use it directly.
</div>
<script language="javascript">
var index=0;
var word=document.getElementById("w").innerHTML;
function type(){
document.getElementById("aa").innerText = word.substring(0,index++);
}
setInterval(type, 200);
</script>
</body>
</html>
