原生JQuery实现拖拽排序```javascriptdiv1div2div3div4div5```

<!DOCTYPE HTML>
<html>
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <title>测试的拖拽功能</title>
    <style type="text/css">
        body, div { margin: 0; paading: 0; font-size: 12px; }
        body { width: 960px; margin: 0 auto; }
        ul, li { margin: 0; padding: 0; list-style: none; }
        .clear { clear: both; width: 1px; height: 0px; line-height: 0px; font-size: 1px; }
 
        .box { width: 600px; height: auto; margin: 25px 0 0 0; padding: 5px; border: 1px solid #f00; }
        .main { position: static; width: 600px; height: 80px; margin-bottom: 5px; border: 1px solid blue; background: #ccc; }
        .maindash { position: absolute; width: 600px; height: 80px; margin-bottom: 5px; border: 1px dashed blue; background: #ececec; opacity: 0.7; }
 
        .hide { width: 600px; height: 80px; margin-bottom: 5px; }
        .dash { position: sta;tic; width: 600px; height: 80px; margin-bottom: 5px; border: 1px dashed #f00; };
    </style>
 
    <script type="text/javascript" src="jquery.js"></script>
    <script src="https://cdn.bootcdn.net/ajax/libs/jquery/3.5.0/jquery.min.js"></script>
    <script type="text/javascript">
    $(document).ready( function () {
        var range = { x: 0, y: 0 };//鼠标元素偏移量
        var lastPos = { x: 0, y: 0, x1: 0, y1: 0 }; //拖拽对象的四个坐标
        var tarPos = { x: 0, y: 0, x1: 0, y1: 0 }; //目标元素对象的坐标初始化
 
        var theDiv = null, move = false;//拖拽对象 拖拽状态
        var theDivId =0, theDivHeight = 0, theDivHalf = 0; tarFirstY = 0; //拖拽对象的索引、高度、的初始化。
        var tarDiv = null, tarFirst, tempDiv;  //要插入的目标元素的对象, 临时的虚线对象
 
        $(".main").each(function(){
            $(this).mousedown(function (event){
                //拖拽对象
                theDiv = $(this);
 
                //鼠标元素相对偏移量
                range.x = event.pageX - theDiv.offset().left;
                range.y = event.pageY - theDiv.offset().top;
 
                theDivId = theDiv.index();
                theDivHeight = theDiv.height();
                theDivHalf = theDivHeight/2;
                move = true;
 
                theDiv.attr("class","maindash");
                // 创建新元素 插入拖拽元素之前的位置(虚线框)
                $("<div class='dash'></div>").insertBefore(theDiv);
                tempDiv = $(".dash");
            });
        });
 
        $(document).mousemove(function(event) {
            if (!move) return false;
            lastPos.x = event.pageX - range.x; //距离屏幕左边距离
            lastPos.y = event.pageY - range.y;  //距离屏幕上边距离
            lastPos.y1 = lastPos.y + theDivHeight; //底部距离屏幕上边距离
 
            // 拖拽元素随鼠标移动
            theDiv.css({left: lastPos.x + 'px',top: lastPos.y + 'px'});
            // 拖拽元素随鼠标移动 查找插入目标元素
 
            var  $main = $('.main'); // 局部变量：按照重新排列过的顺序  再次获取 各个元素的坐标，
            tempDiv = $(".dash"); //获得临时 虚线框的对象
 
            $main.each(function () {
                tarDiv = $(this);
                tarPos.x = tarDiv.offset().left;
                tarPos.y = tarDiv.offset().top;
                tarPos.y1 = tarPos.y + tarDiv.height()/2;
 
                tarFirst = $main.eq(0); // 获得第一个元素
                tarFirstY = tarFirst.offset().top + theDivHalf ; // 第一个元素对象的中心纵坐标
 
                //拖拽对象 移动到第一个位置
                if (lastPos.y <= tarFirstY) {
                    tempDiv.insertBefore(tarFirst);
                }
                //判断要插入目标元素的 坐标后， 直接插入
                if (lastPos.y >= tarPos.y - theDivHalf && lastPos.y1 >= tarPos.y1 ) {
                    tempDiv.insertAfter(tarDiv);
                }
            });
        }).mouseup(function(event) {
            theDiv.insertBefore(tempDiv);  // 拖拽元素插入到 虚线div的位置上
            theDiv.attr("class", "main"); //恢复对象的初始样式
            $('.dash').remove(); // 删除新建的虚线div
            move=false;
        });
    });
</script>
</head>
<body>
    <div class="box" id="box">
        <div class="main" id="main0">div1</div>
        <div class="main" id="main1">div2</div>
        <div class="main" id="main2">div3</div>
        <div class="main" id="main3">div4</div>
        <div class="main" id="main4">div5</div>
    </div>
</body>
</html>