取消a标签在移动端点击时的背景颜色

        a{
            -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);