自定义拼图游戏

html代码：

<div id="box" draggable="true"></div>

css样式：

        *{
            margin: 0;
            padding: 0;
        }
        div{
            width: 800px;
            height: 700px;
            background-color: whitesmoke;
            margin: 10px auto;
            background-repeat: no-repeat;
            background-size: 600px 600px;
            position: relative;
            box-shadow: 0 0 3px 0 gray;
            /* box-sizing: content-box; */
        }
        p{
            box-sizing: border-box;
            position: absolute;
            background-repeat: no-repeat;
            background-size: 800px 700px;
            /* box-sizing: border-box; */
        }

js代码：

var pinTu = {
                pArr:[],
    box:document.getElementById('box'),
    pS