给a标签设置CSS:
-webkit-touch-callout: none;
ps:关于Label不可选中文本的css:
-webkit-touch-callout: none; /* iOS Safari */
-webkit-user-select: none; /* Chrome/Safari/Opera */
-moz-user-select: none; /* Firefox */
-ms-user-select: none; /* Internet Explorer/Edge */
user-select: none; /* Non-prefixed version, currentlynot supported by any browser */