判断是pc端还是手机端js

if(/Android|webOS|iPhone|iPod|BlackBerry/i.test(navigator.userAgent)) {
$('#banner').attr('src','image/banner1.jpg')
} else {
$('#banner').attr('src','image/banner.jpg')
}

 

或者window.location.href = /Android|webOS|iPhone|iPod|BlackBerry/i.test(navigator.userAgent) ? "https://www.baidu.com/" :  "http://news.baidu.com/";