css怎么去掉a标签的颜色

-webkit-tap-highlight-color: rgba(255, 255, 255, 0);
-webkit-user-select: none;
-moz-user-focus: none;
-moz-user-select: none;

a,a:hover,a:active,a:visited,a:link,a:focus{
-webkit-tap-highlight-color:rgba(0,0,0,0);
-webkit-tap-highlight-color: transparent;
outline:none;
background: none;
text-decoration: none;
}

::selection {
background: #FFF;
color: #333;
}
::-moz-selection {
background: #FFF;
color: #333;
}
::-webkit-selection {
background: #FFF;
color: #333;
}

-webkit-tap-highlight-color:rgba(0,0,0,0);