移动端开发注意事项

const _this = this
    window.addEventListener(
      ‘onorientationchange‘ in window ? ‘orientationchange‘ : ‘resize‘,
      function () {
        // if (window.orientation === 180 || window.orientation === 0) {
        //   alert(‘竖屏状态！‘)
        // }
        if (window.orientation === 90 || window.orientation === -90) {
          // alert(‘横屏状态！‘)
          console.log(‘请使用竖屏进行浏览！‘)
        }
      },
      false
    )

@media (min-width: 480px) and (orientation: landscape) {
  html::before {
    width: 100%;
    height: 100%;
    z-index: 99999;
    position: fixed;
    top: 0;
    left: 0;
    content: ‘‘;
    background: #333;
  }
  body:before {
    background-image: url(‘./assets/images/orientation.png‘);
    background-repeat: no-repeat;
    background-size: 100% auto;
    background-position: 50%;
    content: ‘‘;
    height: 200px;
    width: 100px;
    z-index: 99999;
    margin: -140px 0 0 -50px;
    position: absolute;
    color: #fff;
    top: 50%;
    left: 50%;
  }
  body:after {
    content: ‘\4e3a\4e86\66f4\597d\7684\4f53\9a8c\ff0c\8bf7\5c06\624b\673a\7ad6\8fc7\6765‘;
    position: absolute;
    top: 50%;
    text-align: center;
    height: 30px;
    left: 0;
    font-size: 18px;
    z-index: 99999;
    width: 100%;
    color: #fff;
    margin-top: 35px;
  }
}