代码片段： @-webkit-keyframes warn{ 0%{-webkit-transform:scale(0);transform:scale(0);opacity:1} 100%{-webkit-transform:scale(1);transform:scale(1);opacity:0} } @-moz-keyframes warn{ 0%{-moz-transform:scale(0);transform:scale(0);opacity:1} 100%{-moz-transform:scale(1);transform:scale(1);opacity:0} } @-o-keyframes warn{ 0%{-o-transform:scale(0);transform:scale(0);opacity:1} 100%{-o-transform:scale(1);transform:scale(1);opacity:0} }