0418 h5中的dragdssssssssssssssssssssssssssssssssssssssssssssss

<!-- 一般的元素都需要设置一个drag属性，但是img元素不用 -->
<!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>Document</title>
    <style>
     html,body{
            height: 100%;
            overflow: hidden;
        }
        #box{
            position: absolute;
            top: 0;
            left: 0;
            width: 100px;
            height: 100px;
            display: inline-block;
            background-color: red;
            cursor: move;
        }
        #container{
            position: relative;
            width: 300px;
            height: 200px;
            margin: 30px auto;
            box-sizing: border-box;
            border: 2px solid lightseagreen;
        }
        </style>
</head>
<body>
    <div id="box" draggable="true"></div>
    <div id="container"></div>
    <script>
       box.ondragstart = function(ev){
        //    dragEvent 拖拽事件对象
        // dataTransfer(DataTransfer):setData/getData/clearData 设置的内容最后都会变成字符串 setData(类型标识，对应的值)
        // 类型标识：text/plain text/html text/uri-list
        // ev.dataTransfer.setData('@A',100)
        // ev.dataTransfer.setData('text/plain',100)
        ev.dataTransfer.setData('text/plain',ev.target.id)
       }
       container.ondragover = function(ev){
           ev.preventDefault()
       }
       container.ondrop = function(ev){
           ev.preventDefault()
           let _ID=ev.dataTransfer.getData('text/plain'),
           _ELE = document.getElementById(_ID);
           container.appendChild(_ELE)
           console.log(_ID)
       }
    </script>
</body>
</html>