取消选中文字

  div,p,span {

    -webkit-touch-callout: none; /* iOS Safari */

    -webkit-user-select: none; /* Chrome/Safari/Opera */

    -khtml-user-select: none; /* Konqueror */

    -moz-user-select: none; /* Firefox */

    -ms-user-select: none; /* Internet Explorer/Edge */

    user-select: none; /* Non-prefixed version, currently

    not supported by any browser */
  }