a,input,button{outline: none; -webkit-tap-highlight-color: rgba(255, 255, 255, 0); -webkit-focus-ring-color: rgba(0, 0, 0, 0);}

或a,button,input{outline: none; -webkit-tap-highlight-color: rgba(255, 255, 255, 0); -webkit-user-modify: read-write-plaintext-only;}