ie8 video无法播放视频
<!--[if lt IE9]>
<script src="http://html5shiv.googlecode.com/svn/trunk/html5.js"></script>//加上这个video可播放视频
<![endif]-->
判断用户是否用ie浏览器(兼容ie8-ie11)
function isIE() {
if (!!window.ActiveXObject || "ActiveXObject" in window){
alert('是ie')
// return true;
}else{
alert('不是ie')
// return false;
}
}
判断用户是否缩放
function detectZoom (){
var ratio = 0,
screen = window.screen,
ua = navigator.userAgent.toLowerCase();
if (window.devicePixelRatio !== undefined) {
ratio = window.devicePixelRatio;
}
else if (~ua.indexOf('msie')) {
if (screen.deviceXDPI && screen.logicalXDPI) {
ratio = screen.deviceXDPI / screen.logicalXDPI;
}
}
else if (window.outerWidth !== undefined && window.innerWidth !== undefined) {
ratio = window.outerWidth / window.innerWidth;
}
if (ratio){
ratio = Math.round(ratio * 100);
}
return ratio;
};