Summary of how to implement 360-degree panoramic photos with javascript

Summary of how to implement 360-degree panoramic photos with javascript_javascript skills

WBOY

Release： 2016-05-16 15:06:43

Original

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This article shares with you the detailed steps for making a 360-degree panoramic photo. You should pay attention to the following issues:

1. How to make the image load faster when dragging it? ---Note that the performance of hiding images is higher than that of switching images, and when running under IE9, there will be image loading problems
2. How to make pictures rotate at a certain speed
3. Consider two situations if x is a negative number and a negative number

The code is as follows:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<link rel="stylesheet" type="text/css" href="style.css" />
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
<script>
window.onload=function ()
{
  var oImg=document.getElementById('img1');//第一张图片
  var aImg=document.getElementsByTagName('img');
  var lastimage=oImg;
  var x=0;//鼠标拖动某一个点，用该点的位置，来改变src
  var speed=0;
  var lastx=0;
  var timer=null;
  var temp=0;
  for(i=0;i<77;i++)
  {
    var oNewImage=document.createElement('img');
    oNewImage.src='img/miaov ('+i+').jpg'; 
    oNewImage.style.display='none';
    document.body.appendChild(oNewImage);//先将77张图片隐藏
  }
  document.onmousedown=function(ev)
  {
    clearInterval(timer);
    var oEvent=ev||event;
    var disx=oEvent.clientX-x;
    document.onmousemove=function(ev)
    {
       var oEvent=ev||event;
       x=oEvent.clientX-disx;
       setMove(); 
       speed=x-lastx;//记录前后两个速度
       lastx=x;
      return false;
    }
    document.onmouseup=function()
    {
       document.onmousemove=null;
       document.onmouseup=null;
       timer=setInterval(function(){
        x+=speed;
        setMove();
         document.title=speed;
       },30);

    }
    function setMove()
    {
       if(speed>0){speed--;}
       else if(speed==0){clearInterval(timer);}
       else {speed++;}
       temp=-x;//temp要设为全局变量
       if(temp>0)
       {
        temp=-x%77;
       }
       else
       {
        temp=-x+(-Math.floor(-x/77)*77);
       }
       //oImg.src='img/miaov ('+temp+').jpg'; //这里外面要用单引号 
       //alert(aImg.length);
       lastimage.style.display='none';//先让最后一张变为none（刚开始也为第一张，鼠标没有移动时，第一张图片是显示的）
       aImg[temp].style.display='block';//当打开页面时，出现的默认为第一张图片
       lastimage=aImg[temp];
     
       document.title=temp;
    }
    return false;
  }  
}
</script>
</head>
<body>
<img id="img1" src="img/miaov (0).jpg" />
<!--<div id="bg"></div>
<div id="prog">
  360度全景展示 载入中......<span>0%</span>
  <div id="bar"></div>
</div>-->
</body>
</html>

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