lovecoding
/
web0715


			
				
					
						
						
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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: fixed;
            top:0;
            left: 0;
        }
    </style>
</head>
<body>
    <div id="box"></div>
    <script>
        var oBox = document.getElementById("box");
        var oHtml = document.documentElement;
        var _left = 0;
        var _top = 0;
        function moveFun(e){
            oBox.style.top = e.clientY - _top + "px";
            oBox.style.left = e.clientX - _left + "px";
        }

        oBox.addEventListener("mousedown",function(e){
            _left = e.clientX - oBox.offsetLeft;
            _top = e.clientY - oBox.offsetTop;
            oHtml.addEventListener("mousemove",moveFun)
            oBox.addEventListener("mouseup",function(){
                oHtml.removeEventListener("mousemove",moveFun);
            })
        })
    </script>
</body>
</html>