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var CheckOrientation = (function(){ var win = $( window ), get_orientation, last_orientation, initial_orientation_is_landscape, initial_orientation_is_default, portrait_map = { "0": true, "180": true }, ww, wh, landscape_threshold; if(window.orientation !== undefined){ ww = window.innerWidth || win.width(); wh = window.innerHeight || win.height(); landscape_threshold = 50; initial_orientation_is_landscape = ww > wh && ( ww - wh ) > landscape_threshold; initial_orientation_is_default = portrait_map[ window.orientation ]; // (初始是横屏,方向是0或者180), *OR* // 初始是竖屏,方向是90或者-90, we //需要调整portrait_map if ( ( initial_orientation_is_landscape && initial_orientation_is_default ) || ( !initial_orientation_is_landscape && !initial_orientation_is_default ) ) { portrait_map = { "-90": true, "90": true }; } } /** * 判断是横竖屏 * @return {[type]} [description] */ function get_orientation(){ var isPortrait = true, elem = document.documentElement; if ( window.orientation !== undefined ) { isPortrait = portrait_map[ window.orientation ]; } else { isPortrait = elem && elem.clientWidth / elem.clientHeight < 1.1; } return isPortrait ? "portrait" : "landscape"; } last_orientation = get_orientation(); function handler() { var orientation = get_orientation(); if ( orientation !== last_orientation ) { last_orientation = orientation; win.trigger(‘orientation:change‘,[last_orientation]);//借用zepto的trigger事件 } } window.addEventListener("onorientationchange" in window ? "orientationchange" : "resize", handler, false); return { get_orientation : get_orientation } })();
如何使用:
(1)CheckOrientation.get_orientation() //返回的是“portrait”:表示竖屏,返回的是“landscape”表示横屏
(2)$(window).on(‘orientation:change‘,function(e,type){//其中type值是portrait或者是landscape});//横竖屏转换的时候触发
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原文地址:http://www.cnblogs.com/xupeiyu/p/5417471.html