[JavaScript案例]360度全景照片

案例: 360度全景照片鼠标在页面上滑动时图片表现的物体会随着移动方向进行旋转，从而呈现360度物体旋转效果

思路: 将所有的图片都放入指定容器内，通过切换相应的照片隐藏与显示来实现旋转效果

代码:

<!DOCTYPE html>
<html lang="zh-CN">
    <head>
        <meta charset="UTF-8">
        <meta id="viewport" name="viewport" content="width=device-width,initial-scale=1.0,user-scalable=no">
        <title>Document</title>
        <script type="text/javascript" src="360.js"></script>
    </head>
    <body>
        <div class="container" id="page750">
            <img src="img/1.png">
        </div>
    </body>
</html>

html,body{
    margin: 0;
    padding: 0;
}
.container{
    display: flex;
}
img{
    display: block;
    margin: auto;
}

window.onload = function(){
    var container = document.getElementById("page750");
    /*
        一次性将所有的图片标签加入
     */
    var imgCount = 40;
    var lastStartX = 0;
    var iSpeed = 0;
    var timer;
    var _disX;
    for(var i = 2; i <= imgCount; i++){
        (function(i){
            var img = new Image();
            var imgNode = document.createElement("img");
            img.onload = function(){
                imgNode.src = this.src;
                imgNode.style.display = "none";
                container.appendChild(imgNode);
            };
            img.src = "img/"+i+".png";}
        )(i);
    }
    var imgNodes = container.getElementsByTagName("img");
    var lastImgNode = container.getElementsByTagName("img")[0];

    var startX = 0;
    function mouseDownHandler(event){
        console.log("mouse down");
        clearInterval(timer);
        startX = event.clientX;
        document.addEventListener("mousemove", mouseMoveHandler);
        document.addEventListener("mouseup", mouseUpHandler);
        return false;
    }
    function mouseMoveHandler(event){
        console.log("mouse move");
        disX = event.clientX - startX;
        move();
        iSpeed = _disX - lastStartX;
        lastStartX = _disX;
        document.title = _disX;
        return false;
    }
    function mouseUpHandler(event){
        console.log("mouse up");
        document.removeEventListener("mousemove", mouseMoveHandler);
        document.removeEventListener("mouseup", mouseUpHandler);
        document.title = iSpeed;
        timer = setInterval(function(){
            if(iSpeed>0){
                iSpeed--;
            }else{
                iSpeed++;
            }
            if(iSpeed==0){
                clearInterval(timer);
            }
            disX += iSpeed;
            move();
        }, 20);
    }
    function move(){
        _disX = parseInt(disX/20);
        if(_disX>0){
            _disX = disX%imgCount;
        }else{
            _disX = disX - Math.floor(disX/imgCount)*imgCount;
        }
        if(lastImgNode != imgNodes[_disX]){
            lastImgNode.style.display = "none";
            imgNodes[_disX].style.display = "block";
            lastImgNode = imgNodes[_disX];
        }
    }
    document.addEventListener("mousedown", mouseDownHandler);
};

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原文地址：https://www.cnblogs.com/joyjoe/p/6538666.html