JavaScript&CSS检测手机横竖屏

window.orientation:获取屏幕旋转方向

window.addEventListener("resize", ()=>{
    if (window.orientation === 180 || window.orientation === 0) { 
      // 正常方向或屏幕旋转180度
        console.log('竖屏');
    };
    if (window.orientation === 90 || window.orientation === -90 ){ 
       // 屏幕顺时钟旋转90度或屏幕逆时针旋转90度
        console.log('横屏');
    }  
});

CSS检测横屏

@media screen and (orientation: portrait) {
  /*竖屏...*/
} 
@media screen and (orientation: landscape) {
  /*横屏...*/
}