lovecoding
/
W250913


			
				
					
						
						
							12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758596061626364656667686970717273
							<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        body{
            margin: 0;
        }
        .small-img{
            width: 400px;
            height: 400px;
            background-image: url("./img/niu.png");
            background-size: 400px 400px;
            position: relative;
            float: left;
        }
        .bg{
            width: 200px;
            height: 200px;
            background-color: rgba(255,255,255,0.6);
            position: absolute;
        }
        .big-img{
            width: 400px;
            height: 400px;
            background-image: url("./img/niu.png");
            float: left;
            margin-left: 30px;
            background-size: 800px 800px;

        }
    </style>
</head>
<body>
    <div class="small-img">
        <div class="bg"></div>
    </div>
    <div class="big-img">

    </div>
    <script>
        var oBg = document.getElementsByClassName("bg")[0];
        var oSmallImg = document.getElementsByClassName("small-img")[0];
        var oBigImg = document.getElementsByClassName("big-img")[0];
        

        oSmallImg.onmousemove = function(event){
            var x = event.clientX - 100;
            var y = event.clientY - 100;

            if(y<=0){
                y = 0;
            }
            if(x<=0){
                x = 0;
            }
            if(y>=200){
                y = 200;
            }
            if(x >= 200){
                x = 200;
            }

            oBg.style.top = y + "px";
            oBg.style.left = x + "px";
            oBigImg.style.backgroundPosition = (-2*x)+"px " + (-2*y) +"px";
        }

    </script>
</body>
</html>