本来想要随便放一个小视频的，结果丢上去之后各个浏览器显示结果很不一样，折腾了半天算了稍微顺眼一点点，为了防止以后再遇到，就放这里做个笔记，说不定什么时候又用的上呢。

    <script type="text/javascript">
        var ww = $(window).width();
        var hh = $(window).height();

        var video = $('#myVideo');

        video.on('loadedmetadata', function() {
            var videow = video.prop('videoWidth');
            var videoh = video.prop('videoHeight');
            var nn = videow/videoh;
            var xw = xh = 0;

            if(ww>videow && hh>videoh){
                xw = videow * 0.9;
                xh = videoh * 0.9;
            }else if(ww/hh > nn) {
                xh = hh * 0.6;
                xw = xh * nn;
            }else{
                xw = ww * 0.95;
                xh = xw / nn;
            }
            video.width(xw);
            video.height(xh);
        });
    </script>