lovecoding
/
W250511


			
				
					
						
						
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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: 200px;
            height: 200px;
            background-color: red;
            margin: 100px auto;
        }
    </style>
</head>
<body>
    <div id="box"></div>
    <script>
        var oBox = document.getElementById("box");

        oBox.onmousedown = function(e){
            console.log("鼠标按下");
            // offsetX , offsetY 获取鼠标点击位置 距离 元素左上角的位置
            console.log(e.offsetX, e.offsetY);
        }

        oBox.onmouseup = function(){
            console.log("鼠标抬起");

            // 当鼠标抬起的时候移除鼠标移动事件
            oBox.onmousemove = null;
        }

        oBox.onmousemove = function(){
            console.log("鼠标移动");
        }

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