lovecoding
/
Web1020


			
				
					
						
						
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							<!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>
        .box {
            width: 100px;
            height: 100px;
            background-color: red;
            position: absolute;
        }
    </style>
</head>

<body>
    <div class="box"></div>
    <script>
        var oBox = document.getElementsByClassName("box")[0];
        var oDom = document.documentElement;

        oBox.onmousedown = function (e) {
            // 获取鼠标点击的位置
            var x = e.clientX;
            var y = e.clientY;
            // 获取盒子距离页面顶部的距离
            var boxTop = oBox.offsetTop;
            // 获取盒子距离页面左边的距离
            var boxLeft = oBox.offsetLeft;
            // 获取鼠标点击位置 在盒子里的位置
            var thisTop = y - boxTop;
            var thisLeft = x - boxLeft;
            oDom.onmousemove = function (e) {
                oBox.style.top = e.clientY - thisTop + "px";
                oBox.style.left = e.clientX - thisLeft + "px";
                console.log("move")
            }
        }

        oBox.onmouseup = function () {
            oDom.onmousemove = null;
        }
    </script>
</body>

</html>