面的CSS代码添加到您的样式表时，将删除锚标签，按钮，文件上传的虚线

代码如下:

a:focus, a:active,
button::-moz-focus-inner,
input[type="reset"]::-moz-focus-inner,
input[type="button"]::-moz-focus-inner,
input[type="submit"]::-moz-focus-inner,
select::-moz-focus-inner,
input[type="file"] > input[type="button"]::-moz-focus-inner {
border: 0;
outline : 0;
}