解决微信端手机视频播放兼容性问题

<script type="text/javascript">
//mp4是ios、android普遍支持的格式 
function playVideo(opt) {
var _this = this;
_this.elemt = opt.elemt; //播放器要插入的对象 
_this.src = opt.src; //视频的URL(必设) 
_this.width = opt.width > 0 ? opt.width + "px" : "100%"; //宽度(默认100%) 
_this.height = opt.height > 0 ? opt.height + "px" : "400"; //高度(默认100%) 
_this.autoplay = opt.autoplay == "true" ? "autoplay" : ""; //自动播放（true为自动播放） 
_this.poster = opt.poster; //视频封面，播放时的封面图片 
_this.preload = opt.preload == "true" ? "preload" : ""; //预加载(true时启动加载) 
_this.loop = opt.loop == "true" ? "loop" : ""; //循环播放(true时循环播放) 
var str = "<video id='playVideo' controls "; //根据设置的属性的值，拼写video控件 
str += " width='" + _this.width + "' height='" + _this.height + "' "
+ _this.autoplay + " " + _this.preload + " " + _this.loop + " ";
if (typeof (_this.poster) != "undefined") {
str += " poster='" + _this.poster + "' >";
} else {
str += " > ";
}
str += " <source src='" + _this.src + "' />";
str += "</video>";
this.elemt.innerHTML = str; //将str放到要插入的对象中 
}
playVideo( {
//所有参数，elemt和src为必填其他看需求怎么要求 
//elemt为播放控件要插入的容器，src为视频文件地址，preload为预加载，autoplay是否页面进入就自动播放 
//poster为播放前的遮照图片，loop为是否循环播放，width和heigth默认100% 
elemt : document.getElementById("divVideo"),
src : "${url}",
preload : "true",
autoplay : "true",
poster : "",
loop : "true",
width : "",
heigth : "400px"
});
</script>