HTML5-javascript屏幕旋转事件：onorientationchange

/* 屏幕旋转事件：onorientationchange

添加屏幕旋转事件侦听，可随时发现屏幕旋转状态（左旋、右旋还是没旋）

*/

// 判断屏幕是否旋转

function orientationChange() {

switch(window.orientation) {

　　case 0:

alert("肖像模式 0,screen-width: " + screen.width + "; screen-height:" + screen.height);

break;

　　case -90:

alert("左旋 -90,screen-width: " + screen.width + "; screen-height:" + screen.height);

break;

　　case 90:

alert("右旋 90,screen-width: " + screen.width + "; screen-height:" + screen.height);

break;

　　case 180:

　　alert("风景模式 180,screen-width: " + screen.width + "; screen-height:" + screen.height);

　　break;

};

};

// 添加事件监听

addEventListener(‘load‘, function(){

orientationChange();

window.onorientationchange = orientationChange;

});