a {
text-decoration: none;//去掉下划线
color: inherit;
-webkit-user-select: none;
-moz-user-select: none;
user-select: none;
-webkit-appearance: none;
-webkit-text-size-adjust: none;
-webkit-tap-highlight-color: rgba(0, 0, 0, 0);
-webkit-touch-callout: none;
border-bottom: none;//去掉下边框(用text-decoration: none;没有用是时候加上);
display: block;
width: 100%;
height: 40px;
}