


Detailed explanation of examples of motion framework encapsulation in js
<span style="font-size: 18px;"> //获取非行间样式的封装</span><br><span style="font-size: 18px;"> function setStyle(obj,name){</span><br><span style="font-size: 18px;"> // 考虑兼容性问题</span><br><span style="font-size: 18px;"> if(obj.currentStyle){//不兼容火狐和谷歌</span><br><span style="font-size: 18px;"> return obj.currentStyle[name];</span><br><span style="font-size: 18px;"> }else{</span><br><span style="font-size: 18px;"> return getComputedStyle(obj,false)[name];//不兼容IE</span><br><span style="font-size: 18px;"> }</span><br><span style="font-size: 18px;"> }</span>
<span style="font-size: 18px;"> function move(obj,json,complete) {</span><br><span style="font-size: 18px;">// 用计时器前先清除,防止多次点击</span><br><span style="font-size: 18px;"> clearInterval(obj.timer);</span><br><span style="font-size: 18px;">// 设置complete的默认值</span><br><span style="font-size: 18px;"> var complete=complete||{};//如果有就是用户传入的值,否则就是一个空对象</span><br><span style="font-size: 18px;"> complete.dur=complete.dur||2000;//时间:如果有就是用户传入的值,否则默认2000</span><br><span style="font-size: 18px;"> complete.easing=complete.easing||"linear";//运动方式:如果有就是用户传入的值,否则默认匀速</span><br><span style="font-size: 18px;"> //总步数=总时间÷计时器设定的时间</span><br><span style="font-size: 18px;"> var count = parseInt(complete.dur / 30);</span><br><span style="font-size: 18px;"> //起始位置,先定义一个json</span><br><span style="font-size: 18px;"> var start={};</span><br><span style="font-size: 18px;"> //总距离=传入的距离-起始距离</span><br><span style="font-size: 18px;"> var dis={};</span><br><span style="font-size: 18px;">// 因为传入了多个起始目标和多个终点目标,所以先循环</span><br><span style="font-size: 18px;"> for(name in json){</span><br><span style="font-size: 18px;"> start[name]=parseFloat(setStyle(obj,name));</span><br><span style="font-size: 18px;"> dis[name]=json[name]-start[name];</span><br><span style="font-size: 18px;"> }</span><br><span style="font-size: 18px;">// 每步运动的距离=总距离÷总步数</span><br><span style="font-size: 18px;">// var spen = dis[name] / count;</span><br><span style="font-size: 18px;">// 定义起始步数</span><br><span style="font-size: 18px;"> var n = 0;</span><br><span style="font-size: 18px;"> obj.timer = setInterval(function () {</span><br><span style="font-size: 18px;"> n++;</span><br><span style="font-size: 18px;"> for(name in json){</span><br><span style="font-size: 18px;"> var a=n/count;</span><br><span style="font-size: 18px;"> switch(complete.easing){//判断</span><br><span style="font-size: 18px;"> case "linear":</span><br><span style="font-size: 18px;"> var cur=start[name] + a * dis[name];//起始位置+当前运动的距离*总距离÷总步数,数学中先乘后除或先除后乘结果都一样</span><br><span style="font-size: 18px;"> break;</span><br><span style="font-size: 18px;"> case "ease-in":</span><br><span style="font-size: 18px;"> var cur=start[name] + Math.pow(a,3) * dis[name];</span><br><span style="font-size: 18px;"> break;</span><br><span style="font-size: 18px;"> case "ease-out":</span><br><span style="font-size: 18px;"> var a=1-n/count;</span><br><span style="font-size: 18px;"> var cur=start[name] +(1-Math.pow(a,3)) * dis[name];</span><br><span style="font-size: 18px;"> break;</span><br><span style="font-size: 18px;"> }</span><br><span style="font-size: 18px;">// 把当前运动的位置保存</span><br><br><span style="font-size: 18px;">// 判断属性是不是透明度,透明度不用加单位</span><br><span style="font-size: 18px;"> if(name=='opacity'){</span><br><span style="font-size: 18px;"> obj.style[name]=cur;</span><br><span style="font-size: 18px;">// 兼容IE低版本,IE的透明度是1到100</span><br><span style="font-size: 18px;"> obj.style.filter='alpha('+cur*100+')';</span><br><span style="font-size: 18px;"> }else {</span><br><span style="font-size: 18px;"> obj.style[name] = cur + "px";</span><br><span style="font-size: 18px;"> }</span><br><span style="font-size: 18px;"> }</span><br><br><span style="font-size: 18px;">// 判断运动是否完成</span><br><span style="font-size: 18px;"> if (n == count) {</span><br><span style="font-size: 18px;">// 完成后清除定时器,停止运动</span><br><span style="font-size: 18px;"> clearInterval(obj.timer);</span><br><span style="font-size: 18px;">// 判断用户是否传入回调函数</span><br><span style="font-size: 18px;"> complete.fn && complete.fn();</span><br><span style="font-size: 18px;"> }</span><br><span style="font-size: 18px;"> }, 30);</span><br><span style="font-size: 18px;"> }</span><br><span style="font-size: 18px;"> </span><br>
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