不要尝试固定窗口。方向查询(0,90等并不意味着纵向，横向等):

http://www.matthewgifford.com/blog/2011/12/22/a-misconception-about-window-orientation/

即使在iOS7上，0也不总是竖屏的，这取决于你进入浏览器的方式

大卫·沃尔什的方法更好，更切中要害。

// Listen for orientation changes
window.addEventListener("orientationchange", function() {
  // Announce the new orientation number
  alert(window.orientation);
}, false);

在这些更改期间，窗口。方向属性可能会改变。值为0表示纵向视图，-90表示设备横向向右旋转，90表示设备横向向左旋转。

http://davidwalsh.name/orientation-change

我用的是Android Chrome的“屏幕朝向API”

要查看当前的方向，请调用console.log(screen.orientation.type)(也可以调用screen.orientation.angle)。

结果:肖像-主|肖像-次|景观-主|景观-次

下面是我的代码，希望对大家有所帮助:

var m_isOrientation = ("orientation" in screen) && (typeof screen.orientation.lock == 'function') && (typeof screen.orientation.unlock == 'function');
...
if (!isFullscreen()) return;
screen.orientation.lock('landscape-secondary').then(
    function() {
        console.log('new orientation is landscape-secondary');
    },
    function(e) {
        console.error(e);
    }
);//here's Promise
...
screen.orientation.unlock();

我只测试了Android Chrome -好的

或者你可以用这个…

window.addEventListener("orientationchange", function() {
    if (window.orientation == "90" || window.orientation == "-90") {
        //Do stuff
    }
}, false);

//see also http://stackoverflow.com/questions/641857/javascript-window-resize-event
//see also http://mbccs.blogspot.com/2007/11/fixing-window-resize-event-in-ie.html
/*
Be wary of this:
While you can just hook up to the standard window resize event, you'll find that in IE, the event is fired once for every X and once for every Y axis movement, resulting in a ton of events being fired which might have a performance impact on your site if rendering is an intensive task.
*/

//setup 
window.onresize = function(event) {
    window_resize(event);
}

//timeout wrapper points with doResizeCode as callback
function window_resize(e) { 
     window.clearTimeout(resizeTimeoutId); 
     resizeTimeoutId = window.setTimeout('doResizeCode();', 10); 
}

//wrapper for height/width check
function doResizeCode() {
    if(window.innerHeight > window.innerWidth){
        alert("Please view in landscape");
    }
}

如果您有最新的浏览器窗口。定向可能行不通。在这种情况下，使用下面的代码获取角度

var orientation = window.screen.orientation.angle;

这仍然是一个实验技术，你可以在这里检查浏览器兼容性