去掉火狐里面点击按钮时候的虚线边框
button::-moz-focus-inner, input[type="reset"]::-moz-focus-inner, input[type="button"]::-moz-focus-inner, input[type="submit"]::-moz-focus-inner, input[type="file"] > input[type="button"]::-moz-focus-inner { border:none }
去掉a的虚线边框
a{outline:none;}