CSS3 抛物线 加入购物车

分类： 前端2015-07-31 16:42 151人阅读 评论(0) 收藏 举报

动画效果

目录(?)[+]

前言

项目中用到购物车抛物线动画 一开始使用的是Jquery插件 jquery.fly.js;在手机上使用时一些较手机效果不是很好，因为这个插件会根据抛物线动画时间和距离计算抛物线点轨迹（FPS，说是一秒要有60帧的样子）会有卡顿现象，而且还有window.requestAnimationFrame的兼容性问题 ，如果在只是PC段使用还是挺好的。下面介绍我们使用CSS3的方式。

开始介绍之前，建议看下大神的文章 贝塞尔曲线与CSS3动画、SVG和canvas的基情

先贴代码 
//使用的是Css3 两个元素，外面的元素纵坐标移动，里面的元素横坐标移动 不使用keyframe

JavaScript

预设5个抛物点，这部分视情况是否要这样做

<code class="hljs applescript has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;">var $pointDiv = $('<<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">div</span> <span class="hljs-property" style="box-sizing: border-box;">id</span>=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"pointDivs"</span>>').appendTo('body');<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">for</span>(var i = <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span>;i<<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">5</span>;i++){    $('<<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">div</span> <span class="hljs-type" style="box-sizing: border-box;">class</span>=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"point-outer point-pre"</span>><<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">div</span> <span class="hljs-type" style="box-sizing: border-box;">class</span>=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"point-inner"</span>/》</<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">div</span>>').appendTo($pointDiv);}</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li></ul>

点击事件代码

<code class="hljs javascript has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">//获取开始点坐标</span><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">var</span> startOffset = $(ev.target).offset();<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">//获取结束点坐标</span><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">var</span> endTop = window.innerHeight - <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">30</span>, endLeft = <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">20</span>,left = startOffset.left+<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">10</span>,top = startOffset.top+<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">10</span>;<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">var</span> outer = $(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'#pointDivs .point-pre'</span>).first().removeClass(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"point-pre"</span>).css({left:left+<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'px'</span>,top:top+<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'px'</span>});<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">var</span> inner = outer.find(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">".point-inner"</span>);setTimeout(<span class="hljs-function" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">function</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">()</span>{</span>    outer[<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span>].style.webkitTransform = <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'translate3d(0,'</span>+(endTop - top)+<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'px,0)'</span>;    inner[<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span>].style.webkitTransform = <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'translate3d('</span>+(endLeft - left)+<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'px,0,0)'</span>;    setTimeout(<span class="hljs-function" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">function</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">()</span>{</span>        outer.removeAttr(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"style"</span>).addClass(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"point-pre"</span>);        inner.removeAttr(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"style"</span>);    },<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">800</span>);},<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">1</span>);</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li></ul>

CSS

<code class="hljs css has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-class" style="box-sizing: border-box; color: rgb(155, 112, 63);">.point-outer</span><span class="hljs-rules" style="box-sizing: border-box;">{    <span class="hljs-rule" style="box-sizing: border-box;"><span class="hljs-attribute" style="box-sizing: border-box;">position</span>:<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 102, 102);">absolute</span></span>;     <span class="hljs-rule" style="box-sizing: border-box;"><span class="hljs-attribute" style="box-sizing: border-box;">z-index</span>:<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 102, 102);"><span class="hljs-number" style="box-sizing: border-box;">20</span></span></span>;    <span class="hljs-rule" style="box-sizing: border-box;"><span class="hljs-attribute" style="box-sizing: border-box;">-webkit-transition</span>:<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 102, 102);">all <span class="hljs-number" style="box-sizing: border-box;">0.8</span>s <span class="hljs-function" style="box-sizing: border-box;">cubic-bezier(<span class="hljs-number" style="box-sizing: border-box;">0.39</span>,-<span class="hljs-number" style="box-sizing: border-box;">0.4</span>,<span class="hljs-number" style="box-sizing: border-box;">0.83</span>,<span class="hljs-number" style="box-sizing: border-box;">0.23</span>)</span> <span class="hljs-number" style="box-sizing: border-box;">0</span>s</span></span>;<span class="hljs-rule" style="box-sizing: border-box;">}</span></span><span class="hljs-class" style="box-sizing: border-box; color: rgb(155, 112, 63);">.point-inner</span><span class="hljs-rules" style="box-sizing: border-box;">{    <span class="hljs-rule" style="box-sizing: border-box;"><span class="hljs-attribute" style="box-sizing: border-box;">width</span>:<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 102, 102);"><span class="hljs-number" style="box-sizing: border-box;">10</span>px</span></span>;    <span class="hljs-rule" style="box-sizing: border-box;"><span class="hljs-attribute" style="box-sizing: border-box;">height</span>:<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 102, 102);"><span class="hljs-number" style="box-sizing: border-box;">10</span>px</span></span>;     <span class="hljs-rule" style="box-sizing: border-box;"><span class="hljs-attribute" style="box-sizing: border-box;">border-radius</span>:<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 102, 102);"><span class="hljs-number" style="box-sizing: border-box;">50</span>%</span></span>;    <span class="hljs-rule" style="box-sizing: border-box;"><span class="hljs-attribute" style="box-sizing: border-box;">background-color</span>:<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 102, 102);"><span class="hljs-hexcolor" style="box-sizing: border-box;">#ff6326</span></span></span>;     <span class="hljs-rule" style="box-sizing: border-box;"><span class="hljs-attribute" style="box-sizing: border-box;">-webkit-transition</span>:<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 102, 102);">all <span class="hljs-number" style="box-sizing: border-box;">0.8</span>s linear <span class="hljs-number" style="box-sizing: border-box;">0</span>s</span></span>;<span class="hljs-rule" style="box-sizing: border-box;">}</span></span><span class="hljs-class" style="box-sizing: border-box; color: rgb(155, 112, 63);">.point-outer</span><span class="hljs-class" style="box-sizing: border-box; color: rgb(155, 112, 63);">.point-pre</span><span class="hljs-rules" style="box-sizing: border-box;">{    <span class="hljs-rule" style="box-sizing: border-box;"><span class="hljs-attribute" style="box-sizing: border-box;">display</span>:<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 102, 102);">none</span></span>;<span class="hljs-rule" style="box-sizing: border-box;">}</span></span></code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li></ul>

说明

使用div中嵌入div：外面的div是outer,里面的是inner 。outer 的css设置其垂直方向运动，inner的css设置水平方式运动。为达到抛物线效果，inner的运动速度设置的匀速（linear），而outer运动速度由贝塞尔曲线(cubic-bezier(n,n,n,n))设定，贝塞尔曲线值可以参考示例中的值。

这里在说明下JS中的两个setTimeout。第一个setTimeout是等元素定位到起始点，第二个是抛物线动画自行完成后隐藏抛物点。

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