media 查询

<meta name="viewport" content="width=device-width, initial-scale=1.0">

<style>
@media only screen and (max-width: 800px) {
	table td:nth-child(2),
	table th:nth-child(2) {display: none;}
}
 
@media only screen and (max-width: 640px) {
	table td:nth-child(4),
	table th:nth-child(4),
	table td:nth-child(7),
	table th:nth-child(7),
	table td:nth-child(8),
	th:nth-child(8){display: none;}
}
</style>