CSS3实现折纸效果

来源：互联网发布：2015最新dj网络歌曲编辑：程序博客网时间：2024/04/30 02:17

1.折纸布局很特别：

DIV里套DIV，主要为了在实现折叠时，能够连接起来，中间不会开出一条缝，一种很巧妙的方式

<div id="wrap"><h2>我是标题奥</h2>    <div>    <span>选项1</span>        <div>        <span>选项2</span>            <div>            <span>选项3</span>                <div>                <span>选项4</span>                    <div>                    <span>选项5</span>                        <div>                        <span>选项6</span>                            <div style="">                            <span>选项7</span>                            </div>                        </div>                    </div>                </div>            </div>        </div>    </div></div>

#wrap div{ position:absolute<span style="color:#ff0000;">;top:32px</span>; width:100%;left:0; -webkit-transform-style:preserve-3d; -webkit-transform-origin:top;-webkit-transform:rotateX(-120deg);}

因为DIV是嵌套的，top是相对于上一个DIV，就可以实现连接竖向排列

3.实现向下运动渐变的效果，使用了box-shadow

#wrap span{ display:block;height:30px;background:#9F0; font:12px/30px "宋体"; color:#fff; text-indent:20px; <span style="color:#ff0000;">box-shadow:inset 0 0 0 20px rgba(0,0,0,1); transition:1s</span>;}

4.防止按钮点击多次，速度加快

if(oTimer)//已经开启，什么都不做{return;}

clearInterval(oTimer);oTimer=null;

整体代码:

<!DOCTYPE HTML><html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"><title>无标题文档</title><style>@-webkit-keyframes open{0%{-webkit-transform:rotateX(-120deg);}25%{-webkit-transform:rotateX(30deg);}50%{-webkit-transform:rotateX(-15deg);}75%{-webkit-transform:rotateX(8deg);}100%{-webkit-transform:rotateX(0deg);}}@-webkit-keyframes clos{0%{-webkit-transform:rotateX(0deg);}100%{-webkit-transform:rotateX(-120deg);}}body{margin:0;}#wrap{ width:160px;margin:30px auto; position:relative; -webkit-perspective:800px;}#wrap h2{ height:40px;background:#F60; color:#fff; font: bold 16px/40px "微软雅黑"; text-align:center;margin:0; position:relative;z-index:10;}#wrap div{ position:absolute;top:32px; width:100%;left:0; -webkit-transform-style:preserve-3d; -webkit-transform-origin:top;-webkit-transform:rotateX(-120deg);}#wrap span{ display:block;height:30px;background:#9F0; font:12px/30px "宋体"; color:#fff; text-indent:20px; box-shadow:inset 0 0 0 20px rgba(0,0,0,1); transition:1s;}#wrap>div{top:40px;}#wrap .show{-webkit-animation:2s open;-webkit-transform:rotateX(0deg);}#wrap .hide{-webkit-animation:0.8s clos;-webkit-transform:rotateX(-120deg);}#wrap .show>span{ box-shadow:inset 0 0 0 20px rgba(0,0,0,0);}#btn{ position:absolute;}</style></head><body><input type="button" value="按钮" id="btn" /><div id="wrap"><h2>我是标题奥</h2>    <div>    <span>选项1</span>        <div>        <span>选项2</span>            <div>            <span>选项3</span>                <div>                <span>选项4</span>                    <div>                    <span>选项5</span>                        <div>                        <span>选项6</span>                            <div style="">                            <span>选项7</span>                            </div>                        </div>                    </div>                </div>            </div>        </div>    </div></div><script>var oBtn=document.getElementById("btn");var oWrap=document.getElementById("wrap");var aDiv=oWrap.getElementsByTagName("div");var iDelay=200;var oTimer=null;var i=0;var bOff=true;oBtn.onclick=function(){if(oTimer)//已经开启，什么都不做{return;}if(bOff){i=0;oTimer=setInterval(function(){aDiv[i].className="show";i++;if(i==aDiv.length){clearInterval(oTimer);oTimer=null;bOff=false;}},iDelay);}else{i=aDiv.length-1;oTimer=setInterval(function(){aDiv[i].className="hide";i--;if(i<0){clearInterval(oTimer);bOff=true;oTimer=null;}},iDelay);}};</script></body></html>

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