一、前言
最近CSDN的热榜出现了很多用Python、C/C++等编程语言实现的圣诞树，发现很少用前端的，这篇文章用前端三大杀手Html5、CSS、Js来实现动态圣诞树。
二、圣诞树
效果展示：
备注：
整体圣诞树分为3个部分，书的主干、粒子特效、树上的卡片
树上的卡片(重点)：每一张卡片上都有一个名字，代表圣诞树的叶子，后面可以根据自己需求更改，比如全部改成喜欢人的名字，在JS代码的第五行内更改内容
树的动态旋转通过js实现、主干是html5、样式CSS
三、编码实现
CSS代码：
/********************************************* * RESET *********************************************/
html{color:#000;background:#222222;}a{cursor:pointer;}html,body,div,dl,dt,dd,ul,ol,li,h1,h2,h3,h4,h5,h6,pre,code,form,fieldset,legend,input,textarea,p,blockquote,th,td{margin:0;padding:0;}table{border-collapse:collapse;border-spacing:0;}fieldset,img{border:0;}address,caption,cite,code,dfn,em,strong,th,var{font-style:normal;font-weight:normal;}li{list-style:none;}caption,th{text-align:left;}/* h1,h2,h3,h4,h5,h6{font-size:100%;} */q:before,q:after{content:'';}abbr,acronym {border:0;font-variant:normal;}sup {vertical-align:text-top;}sub {vertical-align:text-bottom;}input,textarea,select{font-family:inherit;font-size:inherit;font-weight:inherit;outline-style:none;outline-width:0pt;}legend{color:#000;}a:focus,object,h1,h2,h3,h4,h5,h6{-moz-outline-style: none; border:0px;}/*input[type="Submit"]{cursor:pointer;}*/strong {font-weight: bold;}
/********************************************* * GLOBAL *********************************************/
body, html { overflow: hidden; font-family: Helvetica, Arial, sans-serif; color: #fff; font-size: 11px;
width: 100%; height: 100%;
background: #b72424; background: -moz-radial-gradient(center, ellipse cover, #b72424 0%, #492727 100%); background: -webkit-gradient(radial, center center, 0px, center center, 100%, color-stop(0%,#b72424), color-stop(100%,#492727)); background: -webkit-radial-gradient(center, ellipse cover, #b72424 0%,#492727 100%); background: radial-gradient(center, ellipse cover, #b72424 0%,#492727 100%);}
@keyframes spin { 0% { transform: rotateY( 0deg ); } 100% { transform: rotateY( 360deg ); }}
body { perspective: 3000px; perspective-origin: 0 20%;}
.tree { margin: 0 auto; position: relative; animation: spin 18s infinite linear; transform-origin: 50% 0; transform-style: preserve-3d;}
.tree * { position: absolute; transform-origin: 0 0;}
Html代码：
<!DOCTYPE html><html lang="en"> <head> <meta charset="utf-8">
<meta name="description" content="A Christmas tree built out of form elements." /> <meta name="author" content="Hakim El Hattab" />
<meta http-equiv="X-UA-Compatible" content="chrome=1">
<title>DOM Tree</title>
<link href="css/domtree.css" rel="stylesheet" media="screen" />
<link href='https://fonts.googleapis.com/css?family=Armata' rel='stylesheet' type='text/css'>
</head> <body> <div class="tree"></div>
<script src="js/domtree.js"></script>
<!-- Third party scripts and sharing UI --> <p class="project-title">DOM Tree</p>
<div class="credits"> <a href="https://blog.csdn.net/qq_53673551?spm=1000.2115.3001.5343">知心宝贝</a> <a href="https://twitter.com/hakimel">文章代码参考@hakimel</a> </div>
<style type="text/css" media="screen"> .project-title { position: absolute; left: 25px; bottom: 20px;
font-size: 16px; color: #fff; }
.credits { position: absolute; right: 20px; bottom: 25px; font-size: 15px; z-index: 20; color: #fff; vertical-align: middle; }
.credits * + * { margin-left: 15px; }
.credits a { padding: 8px 10px; color: rgba(255,255,255,0.7); border: 2px solid rgba(255,255,255,0.7); text-decoration: none; }
.credits a:hover { border-color: #fff; color: #fff; }
@media screen and (max-width: 1040px) { .project-title { display: none; }
.credits { width: 100%; left: 0; right: auto; bottom: 0; padding: 30px 0; background: #b72424; text-align: center; }
.credits a { display: inline-block; margin-top: 7px; margin-bottom: 7px; } }</style>
<script> var _gaq = [['_setAccount', 'UA-15240703-1'], ['_trackPageview']]; (function(d, t) { var g = d.createElement(t), s = d.getElementsByTagName(t)[0]; g.async = true; g.src = ('https:' == location.protocol ? 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js'; s.parentNode.insertBefore(g, s); })(document, 'script');</script>
</body></html>
JS代码：
const width = 500;const height = 600;const quantity = 150;const types = [ 'text', 'select', 'progress', 'meter', 'button', 'radio', 'checkbox' ];const greetings = [ '知心宝贝','知心宝贝','Merry Christmas','Merry Christmas','Merry Christmas','Merry Christmas','知心宝贝','12月25','知心宝贝','Merry Christmas','Happy Holidays', ' 知心宝贝','12月25','知心宝贝','Merry Christmas','知心宝贝','Merry Christmas','知心宝贝' ];let tree = document.querySelector( '.tree' ), treeRotation = 0;
tree.style.width = width + 'px';tree.style.height = height + 'px';
window.addEventListener( 'resize', resize, false );
// The treefor( var i = 0; i < quantity; i++ ) { let element = null, type = types[ Math.floor( Math.random() * types.length ) ], greeting = greetings[ Math.floor( Math.random() * greetings.length ) ];
let x = width/2, y = Math.round( Math.random() * height );
let rx = 0, ry = Math.random() * 360, rz = -Math.random() * 15;
let elemenWidth = 5 + ( ( y / height ) * width / 2 ), elemenHeight = 26;
switch( type ) { case 'button': element = document.createElement( 'button' ); element.textContent = greeting; element.style.width = elemenWidth + 'px'; element.style.height = elemenHeight + 'px'; break; case 'progress': element = document.createElement( 'progress' ); element.style.width = elemenWidth + 'px'; element.style.height = elemenHeight + 'px'; if( Math.random() > 0.5 ) { element.setAttribute( 'max', '100' ); element.setAttribute( 'value', Math.round( Math.random() * 100 ) ); } break; case 'select': element = document.createElement( 'select' ); element.setAttribute( 'selected', greeting ); element.innerHTML = '<option>' + greetings.join( '</option><option>' ) + '</option>'; element.style.width = elemenWidth + 'px'; element.style.height = elemenHeight + 'px'; break; case 'meter': element = document.createElement( 'meter' ); element.setAttribute( 'min', '0' ); element.setAttribute( 'max', '100' ); element.setAttribute( 'value', Math.round( Math.random() * 100 ) ); element.style.width = elemenWidth + 'px'; element.style.height = elemenHeight + 'px'; break; case 'text': default: element = document.createElement( 'input' ); element.setAttribute( 'type', 'text' ); element.setAttribute( 'value', greeting ); element.style.width = elemenWidth + 'px'; element.style.height = elemenHeight + 'px'; }
element.style.transform = `translate3d(${x}px, ${y}px, 0px) rotateX(${rx}deg) rotateY(${ry}deg) rotateZ(${rz}deg)`;
tree.appendChild( element );}
// Let it snowfor( var i = 0; i < 200; i++ ) { let element = document.createElement( 'input' ); element.setAttribute( 'type', 'radio' );
let spread = window.innerWidth/2;
let x = Math.round( Math.random() * spread ) - ( spread / 4 ), y = Math.round( Math.random() * height ), z = Math.round( Math.random() * spread ) - ( spread / 2 );
let rx = 0, ry = Math.random() * 360, rz = 0;
if( Math.random() > 0.5 ) element.setAttribute( 'checked', '' );
element.style.transform = `translate3d(${x}px, ${y}px, ${z}px) rotateX(${rx}deg) rotateY(${ry}deg) rotateZ(${rz}deg)`;
tree.appendChild( element );}
function resize() { tree.style.top = ( ( window.innerHeight - height - 100 ) / 2 ) + 'px';}
resize();
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