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 */
	}