JavaScript实现元素属性的缓冲变化
Posted
tags:
篇首语：本文由小常识网(cha138.com)小编为大家整理，主要介绍了JavaScript实现元素属性的缓冲变化相关的知识，希望对你有一定的参考价值。
---------------------------------------------------
今天给大家分享一个用javascript实现
元素的属性缓冲变化效果，代码如下：
---------------------------------------------------
1 //获取样式 2 function getStyle( obj, attr ){ //封装的获取元素样式的函数; 3 4 if(obj.currentStyle){ 5 6 return obj.currentStyle[attr]; 7 8 }else{ 9 10 return getComputedStyle(obj,false)[attr]; 11 } 12 }
1 function Slow_change( obj, attr, tar, fn ){ //opacity范围为1~100; 2 clearInterval(obj.timer); //清除定时器; 3 obj.timer = setInterval(function(){ 4 let cur = 0; 5 if(attr == ‘opacity‘){ //获取要改变的样式;透明度分开来实现; 6 cur = parseInt(parseFloat(getStyle(obj,attr))*100); //取整; 7 }else{ 8 cur = parseInt(getStyle(obj,attr)); 9 }; 10 let speed = (tar - cur)/8;//大于1的整数 11 speed = speed > 0 ? Math.ceil(speed) : Math.floor(speed); //根据速度的正负向上和向下取整; 12 if( cur == tar ){ 13 clearInterval(obj.timer); //达到预定值时清除定时器; 14 if(attr == ‘opacity‘){ 15 obj.style.filter = ‘alpha(opacity:‘+ cur +‘)‘; 16 obj.style.opacity = cur/100; 17 }else{ 18 obj.style[attr] = tar + ‘px‘; 19 } 20 fn && fn(); //调用回调函数; 21 }else{ 22 if(attr == ‘opacity‘){ 23 obj.style.filter = ‘alpha(opacity:‘ + (cur+speed) + ‘)‘; 24 obj.style.opacity = (cur+speed)/100; 25 }else{ 26 obj.style[attr] = cur + speed + ‘px‘; //设置变化后的样式; 27 } 28 } 29 },30); 30 }
--------------------------------------------------
上面就是封装好的缓冲变化函数，通过
出入不同的对象和属性产生不同的缓冲
变化，下面给出一个实例完整的代码：
--------------------------------------------------
1 <!DOCTYPE html> 2 <html lang="en"> 3 <head> 4 <meta charset="UTF-8"> 5 <title>demo</title> 6 <style type="text/css"> 7 *{ 8 margin:0; 9 padding:0; 10 } 11 #box{ 12 position:absolute; 13 width:100px; 14 height:100px; 15 background:red; 16 border:1px solid black; 17 } 18 </style> 19 <script type="text/javascript"> 20 window.onload = function(){ 21 function getStyle( obj, attr ){ 22 23 if(obj.currentStyle){ 24 25 return obj.currentStyle[attr]; 26 27 }else{ 28 29 return getComputedStyle(obj,false)[attr]; 30 } 31 } 32 33 function Slow_change( obj, attr, tar, fn ){ 34 clearInterval(obj.timer); 35 obj.timer = setInterval(function(){ 36 let cur = 0; 37 if(attr == ‘opacity‘){ 38 cur = parseInt(parseFloat(getStyle(obj,attr))*100); 39 }else{ 40 cur = parseInt(getStyle(obj,attr)); 41 }; 42 let speed = (tar - cur)/8; 43 speed = speed > 0 ? Math.ceil(speed) : Math.floor(speed); 44 if( cur == tar ){ 45 clearInterval(obj.timer); 46 if(attr == ‘opacity‘){ 47 obj.style.filter = ‘alpha(opacity:‘+ cur +‘)‘; 48 obj.style.opacity = cur/100; 49 }else{ 50 obj.style[attr] = tar + ‘px‘; 51 } 52 fn && fn(); 53 }else{ 54 if(attr == ‘opacity‘){ 55 obj.style.filter = ‘alpha(opacity:‘ + (cur+speed) + ‘)‘; 56 obj.style.opacity = (cur+speed)/100; 57 }else{ 58 obj.style[attr] = cur + speed + ‘px‘; 59 } 60 } 61 },30); 62 } 63 64 var box = document.getElementById(‘box‘); 65 Slow_change( box,‘left‘,500,function(){ 66 alert(1); 67 }); 68 }; 69 </script> 70 </head> 71 <body> 72 <div id="box"></div> 73 </body> 74 </html>
--------------------Over---------------------
感谢大家的阅读
-----------------------------------------------
以上是关于JavaScript实现元素属性的缓冲变化的主要内容，如果未能解决你的问题，请参考以下文章