js拖拽的封装

<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>无标题文档</title>
<style>
#div1 {width: 100px; height: 100px; background: red; position: absolute;}
#img1 { position: absolute;}
</style>
<script>
window.onload = function() {
    
    var oDiv = document.getElementById('div1');
    var oImg = document.getElementById('img1');
    
    drag(oImg);
    
    drag(oDiv);
    
    function drag(obj) {
        
        obj.onmousedown = function(ev) {
            var ev = ev || event;
            
            var disX = ev.clientX - this.offsetLeft;
            var disY = ev.clientY - this.offsetTop;
            
            if ( obj.setCapture ) {
                obj.setCapture();
            }
            
            document.onmousemove = function(ev) {
                var ev = ev || event;
                
                obj.style.left = ev.clientX - disX + 'px';
                obj.style.top = ev.clientY - disY + 'px';
            }
            
            document.onmouseup = function() {
                document.onmousemove = document.onmouseup = null;
                //释放全局捕获 releaseCapture();
                if ( obj.releaseCapture ) {
                    obj.releaseCapture();
                }
            }
            
            return false;
            
        }
        
    }
    
}
</script>
</head>

<body>
    <div id="div1"></div>
    <img src="1.jpg" id="img1" />
</body>
</html>

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原文地址：https://www.cnblogs.com/nifengs/p/4977517.html