H5 video安卓默认点击不能全屏播放解决办法

var fullscreen = function(elem) {
var prefix = 'webkit';
if ( elem[prefix + 'EnterFullScreen'] ) {
return prefix + 'EnterFullScreen';
} else if( elem[prefix + 'RequestFullScreen'] ) {
return prefix + 'RequestFullScreen';
};
return false;
};

function autoFullScrenn(v){
var ua   = navigator.userAgent.toLowerCase();
var Android = String(ua.match(/android/i)) == "android";
// if(!Android) return;//非android系统不使用;
var video  = v,doc = document;
var fullscreenvideo = fullscreen(doc.createElement("video"));
if(!fullscreen) {
alert("不支持全屏模式");
return;
}
video.addEventListener("webkitfullscreenchange",function(e){
if(!doc.webkitIsFullScreen){//退出全屏暂停视频
this.pause();
// this.pause();
};
}, false);
video.addEventListener("click", function(){
this.play();
video[fullscreenvideo]();
}, false);

video.addEventListener('ended',function(){
doc.webkitCancelFullScreen(); //播放完毕自动退出全屏
},false);

};

// autoFullScrenn(video_obj)