判断页面是在移动端还是PC端打开的

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

if(/Android|webOS|iPhone|iPad|BlackBerry/i.test(navigator.userAgent)) {
    window.location.href = "https://www.baidu.com/";
} else {
    window.location.href = "http://news.baidu.com/";
}