原生js实现fadein 和 fadeout淡入淡出效果
先来看看设置透明度的兼容性代码:
functionsetOpacity(ele,opacity){ if(ele.style.opacity!=undefined){ ///兼容FF和GG和新版本IE ele.style.opacity=opacity/100; }else{ ///兼容老版本ie ele.style.filter="alpha(opacity="+opacity+")"; } }
关于有的小伙伴这样写:
functionsetOpacity(ele,opacity){ if(document.all){ ///兼容ie ele.style.filter="alpha(opacity="+opacity+")"; } ele{ ///兼容FF和GG ele.style.opacity=opacity/100; } }
我想说这样在IE10下运行有问题,点了之后没反应。因为IE10支持opacity属性不支持filter了,这个方法不可取。
fadein函数代码:
functionfadein(ele,opacity,speed){ if(ele){ varv=ele.style.filter.replace("alpha(opacity=","").replace(")","")||ele.style.opacity; v<1&&(v=v*100); varcount=speed/1000; varavg=count<2?(opacity/count):(opacity/count-1); vartimer=null; timer=setInterval(function(){ if(v<opacity){ v+=avg; setOpacity(ele,v); }else{ clearInterval(timer); } },500); } }
fadeout函数代码:
functionfadeout(ele,opacity,speed){ if(ele){ varv=ele.style.filter.replace("alpha(opacity=","").replace(")","")||ele.style.opacity||100; v<1&&(v=v*100); varcount=speed/1000; varavg=(100-opacity)/count; vartimer=null; timer=setInterval(function(){ if(v-avg>opacity){ v-=avg; setOpacity(ele,v); }else{ clearInterval(timer); } },500); } }
下面给一个demo示例:
<!DOCTYPEhtml> <htmlxmlns="http://www.w3.org/1999/xhtml"> <head> <metahttp-equiv="Content-Type"content="text/html;charset=utf-8"/> <title></title> <scripttype="text/javascript"src="fade.js"></script> <scripttype="text/javascript"> window.onload=function(){ document.getElementById('Button1').onclick=function(){ fadeout(document.getElementById('DV'),0,6000); } document.getElementById('Button2').onclick=function(){ fadein(document.getElementById('DV'),80,6000); } } </script> </head> <body> <divid="DV"style="background-color:green;width:400px;height:400px;"></div> <inputid="Button1"type="button"value="button"/> <inputid="Button2"type="button"value="button"/> </body> </html>
有什么更好的实现方式可以留言。。。