//获取窗口宽度
function getwindowwidth() {
    var windowwidth = 0;
    if (typeof (window.innerwidth) == 'number') {
        windowwidth = window.innerwidth;
    }
    else {
        if (document.documentelement && document.documentelement.clientwidth) {
            windowwidth = document.documentelement.clientwidth;
        }
        else {
            if (document.body && document.body.clientwidth) {
                windowwidth = document.body.clientwidth;
            }
        }
    }
    return windowwidth;
}

if(phone()||isweixin()){

var videoiframeobj = document.getelementsbyname("myvideo");
if (videoiframeobj.length > 0) {
    for (var i = 0; i < videoiframeobj.length; i++) {
        var _ddwidth = parseint(getwindowwidth() * 90 / 100);
        var _dheight = 180;
        if (_ddwidth > 0) {
            _dheight = parseint(9 * _ddwidth/16)
        }

        videoiframeobj[i].style = "width:" + _ddwidth + "px;height:" + _dheight + "px;";
        videoiframeobj[i].height = _dheight;
        videoiframeobj[i].width = _ddwidth;
        var videosrc = videoiframeobj[i].src;
        var reger = new regexp("&width=\\d+", "gmi");
        videosrc = videosrc.replace(reger, "&width=" + _ddwidth);
        reger = new regexp("&height=\\d+", "gmi");
        videosrc = videosrc.replace(reger, "&height=" + _dheight);
        videoiframeobj[i].src = videosrc;

    }
}
}
function phone(){
if((navigator.useragent.match(/(phone|pad|pod|iphone|ipod|ios|ipad|android|mobile|blackberry|iemobile|mqqbrowser|juc|fennec|wosbrowser|browserng|webos|symbian|windows phone)/i))) {
  // console.log('移动端');
  return true;
} else {
  // console.log('pc端');
 return false;
}


    }


function isweixin(){
  var ua = window.navigator.useragent.tolowercase();    // 该属性包含了浏览器类型、版本、操作系统类型、浏览器引擎类型等信息
  //通过正则表达式匹配ua中是否含有micromessenger字符串
  if(ua.match(/micromessenger/i) == 'micromessenger'){
    return true;
  }else{
    return false;
  }
}