js 判断手机横竖屏的实现方法(不依赖任何其他库)

<!DOCTYPE html> 
<html>
<head>
<meta http-equiv="Content-Type" content="application/xhtml+xml;charset=UTF-8" />
<meta name="viewport" content="width=device-width" />
<title>手机横、竖屏事件</title> 
<script language="javascript" type="text/javascript">
//屏幕方向标识,0横屏,其他值竖屏
var orientation=0;
//转屏事件,内部功能可以自定义
function screenOrientationEvent(){
    if(orientation == 0)document.getElementById("change").value="竖";
    else document.getElementById("change").value="横";
}
var innerWidthTmp = window.innerWidth;
//横竖屏事件监听方法
function screenOrientationListener(){
    try{
        var iw = window.innerWidth;     
        //屏幕方向改变处理
        if(iw != innerWidthTmp){
            if(iw>window.innerHeight)orientation = 90;
            else orientation = 0;
            //调用转屏事件
            screenOrientationEvent();
            innerWidthTmp = iw;
        }
    } catch(e){alert(e);};
    //间隔固定事件检查是否转屏,默认500毫秒
    setTimeout("screenOrientationListener()",500);
}
//启动横竖屏事件监听
screenOrientationListener();
</script>
</head> 
<body onload="screenOrientationEvent()"> 
<input id="change" type="text" value=""/>
</body>
</html>

参考文章:http://www.dewen.net.cn/q/8694/

posted @ 2019-07-26 10:41  糖糖部落  阅读(419)  评论(0编辑  收藏  举报