CSS清除按钮和超链接点击时的虚线

<style type="text/css">  
    .wrap{position:relative;}  
    .btns{zoom:1;}  
    .btns *{outline:0;zoom:1;background:#f2f2f2;}  
    .btns button::-moz-focus-inner{border-color:transparent!important;}  
</style>