javascript 拖拽图片挑战滑稽大佬

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>拖拽</title>
</head>

<body>
    <style>
        .left {
            display: inline-block;
            position: absolute;

        }

        body {
            margin: 0;
            padding: 0;
        }
    </style>
    <image class="left" draggable="false" src="https://raw.githubusercontent.com/zhaoolee/ChineseBQB/master/001Funny_%E6%BB%91%E7%A8%BD%E5%A4%A7%E4%BD%AC%F0%9F%98%8FBQB/Funny00018.gif"></image>
    <image class="left" draggable="false" src="https://raw.githubusercontent.com/zhaoolee/ChineseBQB/master/001Funny_%E6%BB%91%E7%A8%BD%E5%A4%A7%E4%BD%AC%F0%9F%98%8FBQB/0.gif"></image>
    <image class="left" draggable="false" src="https://raw.githubusercontent.com/zhaoolee/ChineseBQB/master/001Funny_%E6%BB%91%E7%A8%BD%E5%A4%A7%E4%BD%AC%F0%9F%98%8FBQB/Funny00010.gif"></image>

    <script>
        // 跨浏览器的事件处理工具
        var EventUtil = {
            addHandler: function(element, type, handle){
                // 如果存在DOM2级方法
                if(element.addEventListener){
                    // 第三个参数false表示在冒泡阶段进行处理
                    element.addEventListener(type, handle, false);
                // 如果运行在IE浏览器
                } else if(element.attachEvent){
                    element.attachEvent("on" + type, handle);
                // 使用古老的DOM级方法
                } else {
                    element["on" + type] = handler;
                }
            },
            removeHandler: function(element, type, handle){
                // 如果存在DOM2级方法
                if(element.removeEventListener){
                    // 第三个参数false表示在冒泡阶段进行处理
                    element.removeEventListener(type, handle, false);
                // 如果运行在IE浏览器
                } else if(element.detachEvent){
                    element.detachEvent("on" + type, handle);
                // 使用古老的DOM级方法
                } else {
                    element["on" + type] = null;
                }
            },
            getTarget: function (event) {
                return event.target || event.srcElement;
            }
        }


        // 让红色正方形跟随鼠标

        var target_element = null;

        var diff_x = 0;
        var diff_y = 0;

        function follow_mouse(event){
            if(event.type === "mousedown") {
                target_element = EventUtil.getTarget(event);
                diff_x = event.clientX - target_element.offsetLeft;
                diff_y = event.clientY - target_element.offsetTop;
            }

            if(event.type === "mouseup") {
                target_element = null;
            }

            if(target_element !== null && event.type === "mousemove") {
                target_element.style.left = (event.clientX - diff_x) + "px";
                target_element.style.top = (event.clientY - diff_y) + "px";
            }
        }

        EventUtil.addHandler(document, "mousemove", follow_mouse);
        EventUtil.addHandler(document, "mouseup", follow_mouse);
        EventUtil.addHandler(document, "mousedown", follow_mouse);

    </script>
</body>

</html>

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