javascript动画效果类封装代码

functionAnimation(target,targetProperty,closure,precision){closure=closure||function(x){returnx;};precision=precision||10;this.handle;varbeginTime=newDate();varstopTime=newDate();this.Begin=function(){beginTime=newDate();this.handle

 
output1是改变value 
output1是改变宽度 
output3是淡入 
output4是带缓动的宽度