html5 video无法快进如何解决

varvol=0.1;//1代表100%音量，每次增减0.1
vartime=2;//单位秒，每次增减10秒


functionlistenKeyboard(){
varvideoElement=document.getElementById("video");
document.onkeyup=function(event){//键盘事件

vare=event||window.event||arguments.callee.caller.arguments[0];

//鼠标上下键控制视频音量
if(e&&e.keyCode===38){
console.log("音量加1");
//按向上键
videoElement.volume!==1?videoElement.volume+=vol:1;
returnfalse;

}elseif(e&&e.keyCode===40){
console.log("音量减1");
//按向下键
videoElement.volume!==0?videoElement.volume-=vol:1;
returnfalse;

}elseif(e&&e.keyCode===37){
console.log("倒退1秒");
//按向左键
videoElement.currentTime!==0?videoElement.currentTime=videoElement.currentTime-=time:1;
returnfalse;

}elseif(e&&e.keyCode===39){
console.log("前进2秒,当前时间是:"+videoElement.currentTime+",视频长度是："+videoElement.duration);
//按向右键
varcurrPlayTime=videoElement.currentTime;
if(currPlayTime!==videoElement.duration){
varafterSetTime=currPlayTime+time;
console.log('afterSetTimeshouldbe:'+afterSetTime);
videoElement.currentTime=afterSetTime;
console.log('afterSetTimeis:'+videoElement.currentTime);
}else{
videoElement.currentTime=videoElement.currentTime+1;
}
console.log("快进后的时间是:"+videoElement.currentTime);
returnfalse;
}elseif(e&&e.keyCode===32){
console.log("暂停");
//按空格键判断当前是否暂停
videoElement.paused===true?videoElement.play():videoElement.pause();
returnfalse;

}

}
}

StringrangeString=request.getHeader("Range");//如果是video标签发起的请求就不会为null
if(StringUtils免费云主机、域名.isNotBlank(rangeString)){
longrange=Long.valueOf(rangeString.substring(rangeString.indexOf("=")+1,rangeString.indexOf("-")));
response.setHeader("Access-Control-Allow-Origin","*");
response.setHeader("Content-Type","video/mp4");
response.setHeader("content-disposition","attachment;filename="+URLEncoder.encode(file.getName(),"UTF-8"));
intfileLength=(int)file.length();
response.setContentLength(fileLength);//10000是视频文件的大小，上传文件时都会有这些参数的
response.setHeader("Content-Range",String.valueOf(range+(fileLength-1)));//拖动进度条时的断点，其中10000是上面的视频文件大小，改成你的就好
response.setHeader("Accept-Ranges","bytes");
//response.setHeader("Etag","W/"9767057-1323779115364"");//上传文件时都会有这些参数的
response.setHeader("Etag","737060cd8c284d8af7ad3082f209582d");//上传文件时都会有这些参数的
}