function orientation_change() { var viewport = document.querySelector(‘meta[name="viewport"]‘); if (window.orientation == 0 || window.orientation == 180) viewport.setAttribute("content", "width=device-width, maximum-scale=1.0, initial-scale=1.0, user-scalable=no"); else if (window.orientation == -90 || window.orientation == 90) viewport.setAttribute("content", "width=device-height, maximum-scale=1.0, initial-scale=1.0, user-scalable=no"); } window.onorientationchange = orientation_change;
window.orientation
:这个属性给出了当前设备的屏幕方向,0表示竖屏,正负90表示横屏(向左与向右)模式
onorientationchange
: 在每次屏幕方向在横竖屏间切换后,就会触发这个window事件,用法与传统的事件类似
#b{width:300px;height:200px;background:blue;} @media screen and (orientation:portrait){ #b{background:red;} } @media screen and (orientation:landscape){ #b{background:green;} }
时间: 2024-10-12 21:26:59