H5原生拖拽事件

使用原生js实现简单的拖拽事件
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width,initial-scale=1.0">
    <title>Title</title>
    <style>
        #drag-el {
             100px;
            height: 100px;
            background-color: greenyellow;
        }
        #drop-el {
             200px;
            height: 200px;
            background-color: antiquewhite;
        }
    </style>
</head>
<body>
<div id="drop-el"></div>
<div id="drag-el" draggable="true">
    可拖拽元素
</div>



<script>
    window.onload = function () {

        var dropEl = $('#drop-el');
        var dragEl = $('#drag-el');

　　　　//设置关联数据
        dragEl.addEventListener("dragstart", dragstartHandle);

　　　　//禁止默认事件，使其可拖放
        dropEl.addEventListener("dragenter", preventDefault);
        dropEl.addEventListener("dragover", preventDefault);
        //鼠标释放，在拖放目标上接受数据并处理
        dropEl.addEventListener("drop", dropHandle);

        function dropHandle(event) {
            event.preventDefault();
            var data = event.dataTransfer.getData("Text");
            event.target.appendChild($("#" + data));
        }

        function dragstartHandle(event) {
            event.dataTransfer.setData("Text", event.target.id);
        }
        
        function preventDefault(event) {
            console.log(event.type);
            event.preventDefault();
        }

        function $(sel) {
            return document.querySelector(sel);
        }

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