css3 自动无限缩放

@-webkit-keyframes scaleDraw {
0% {
-webkit-transform:scale(1);
}
25% {
-webkit-transform:scale(1.1);
}
50% {
-webkit-transform:scale(1);
}
75% {
-webkit-transform:scale(1.1);
}
}
#drawCon1{
-webkit-animation-name: scaleDraw;
-webkit-animation-timing-function: ease-in-out;
-webkit-animation-iteration-count: infinite;
-webkit-animation-duration: 8s;
-webkit-animation-direction: alternate;
}