所谓文字聚合效果,原理就是将容器分为若干的小块,然后每个小块设置 background-poisition ,最后添加css3动画就可以了,去掉注释,也就仅仅20行的代码。
先来看看效果图:
js代码如下:
//c为列数,r为行数,把box划分成多少个小块 var box = document.querySelector('.boxWrap1'),c=4,r=8; //每个小块的宽高 var w = box.offsetWidth/c,h = box.offsetHeight/r; //循环添加小块 for(var i = 0;i < r;i++){ for(var j = 0;j < c;j++) { var _div=document.createElement('div'); var _left = j * w,_top = i * h; //添加css样式,并设置每个小块的背景 _div.style.cssText = 'width:'+w+'px;height:'+h+'px;left:'+_left+'px;top:'+_top+'px; opacity:0;background-position:'+(-_left) + 'px ' + (-_top) + 'px'; //添加css动画时间 _div.style.transition = 'all '+ Random(1,1.8) +'s ease'; //添加css的transform动画 _div.style.transform = 'perspective(800px) translate3d('+Random(-200,200)+'px, '+Random(-200,200)+'px,300px) rotate('+Random(-90,90)+'deg) scale('+ Random(0,2) +')' //添加 box.appendChild(_div); }; }; //延时添加动画 setTimeout(function(){ box.classList.add('set'); },100); //随机数 function Random(start,end){ return Math.random()*(end-start)+start; };
完整的示例如下:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>利用JS实现文字的聚合动画效果</title> <style> .boxWrap1{width: 160px;height: 417px;position: relative;margin:0px auto;} .boxWrap1 img{width: 100%;} .boxWrap1 div{background: url() no-repeat;background-size: 160px auto; position: absolute; left: 0px;top: 0px; } .boxWrap1.set div{ opacity: 1!important; transform:perspective(800px) translate3d(0px,0px,0px) rotate(0deg) scale(1)!important; -moz-transform:perspective(800px) translate3d(0px,0px,0px) rotate(0deg) scale(1)!important; -webkit-transform:perspective(800px) translate3d(0px,0px,0px) rotate(0deg) scale(1)!important; } .boxSiteWrap{ width: 100%;overflow: hidden;height: auto; background: #000;padding: 140px 0} .boxSiteWrap button{cursor:pointer;display: block;font-size: 16px; width: 140px;height: 40px; background: #fff;color: #000;border:none;margin:30px auto;} </style> </head> <body> <div> <div></div> <button>重新加载</button> </div> <script> window.addEventListener('load',function(){ ;(function(){ function init(){ var box = document.querySelector('.boxWrap1'),c=4,r=8; var w = box.offsetWidth/c,h = box.offsetHeight/r; for(var i=0;i<r;i++){ for(var j=0;j<c;j++) { var _div=document.createElement('div'); var _left = j * w,_top = i * h; _div.style.cssText = 'width:'+w+'px;height:'+h+'px;left:'+_left+'px;top:'+_top+'px; opacity:0;background-position:'+(-_left) + 'px ' + (-_top) + 'px'; _div.style.transition = _div.style.MozTransition = _div.style.WebkitTransition = 'all '+ Random(1,1.8) +'s ease'; _div.style.transform = _div.style.MozTransform = _div.style.WebkitTransform = 'perspective(800px) translate3d('+Random(-200,200)+'px, '+Random(-200,200)+'px,300px) rotate('+Random(-90,90)+'deg) scale('+ Random(0,2) +')' box.appendChild(_div); }; }; setTimeout(function(){ box.classList.add('set') },100); function Random(start,end){ return Math.random()*(end-start)+start; }; }; init(); var flag = true; document.querySelector('button').onclick = function(){ if(flag){ document.querySelector('.boxWrap1').classList.remove('set') setTimeout(function(){ document.querySelector('.boxWrap1').innerHTML = ''; init(); flag = true; },1200); flag = false; }; }; })(); }); </script> </body> </html>