js实现拖拽拼图游戏

<div class="box">
        <div id="d1" class="d1"></div>
        <div id="d2" class="d1"></div>
        <div id="d3" class="d1"></div>
        <div id="d4" class="d1"></div>
        <div id="d5" class="d1"></div>
        <div id="d6" class="d1"></div>
        <div id="d7" class="d1"></div>
        <div id="d8" class="d1"></div>
        <div id="d9" class="d1"></div>
 
    </div>
    <div id="but">
        <button id="but1">一键完成</button>
        <button id="but2">开始游戏</button>
        <button id="but3">看一眼原图</button>
        <div>
            <img id="yan" src="../../图片/2222.jpg" alt="">
        </div>
</div>

* {
            margin: 0;
            padding: 0;
        }
 
        .box {
            width: 312px;
            height: 312px;
            border: 3px solid #000;
            margin: 50px auto 5px;
            font-size: 0;
        }
 
        .box div {
            width: 100px;
            height: 100px;
            display: inline-block;
            border: 2px solid #000;
        }
 
        .d1 {
            background-image: url(../../图片/2222.jpg);
            background-size: 300px 300px;
            background-position: 0px 0px;
        }
 
 
        #but {
            border: 1px solid #000 transparent;
            width: 300px;
            height: 30px;
            margin: 0 auto;
        }
 
        #but img {
            width: 100px;
            height: 100px;
            float: right;
            display: none;
        }
 
        button {
            margin: 1px auto;
            border: 1px solid #000;
        }

var data = [['0 0'], ['-100px 0'], ['-200px 0'], ['0 -100px'], ['-100px -100px'], ['-200px -100px'], ['0 -200px'], ['-100px -200px'], ['-200px -200px']]
 
        var but1 = document.getElementById("but1")
        var but2 = document.getElementById("but2")
        var but3 = document.getElementById("but3")
        var yan = document.getElementById("yan")
        var divs = document.querySelectorAll(".d1")
 
        // 刚打开保持完整
        for (var i = 0; i < divs.length; i++) {
            divs[i].style.backgroundPosition = data[i][0]
        }
        // 一键完成
        but1.addEventListener("click", function () {
            for (var i = 0; i < divs.length; i++) {
                divs[i].style.backgroundPosition = data[i][0]
            }
        })
        // 开始游戏
        but2.addEventListener("click", function () {
var arr = [];
            var maxTimes = 9
            do {
                var num = Math.floor(Math.random() * 9);
                if (-1 == arr.indexOf(num)) {
                    arr.push(num);
                    maxTimes--;
                }
            } while (maxTimes);
            for (var i = 0; i < divs.length; i++) {
                const k = arr[i]
                divs[k].style.backgroundPosition = data[i][0]
            }
        })
        // 看一眼原图
        but3.addEventListener("mousedown", function () {
            yan.style.display = "block"
        })
        but3.addEventListener("mouseup", function () {
            yan.style.display = "none"
        })
        divs.forEach(function (v, i) {
            v.draggable = "true"
            //开始拖拽的时候触发事件
            v.addEventListener("dragstart", function (e) {
                // console.log('666');
                e.dataTransfer.setData("newdivID",e.target.getAttribute("id"))
                e.dataTransfer.setData("newdiv",e.target.style.backgroundPosition)
            })
            
             // 拖拽松开的时候触发事件
            v.addEventListener("drop",function (e) {
                e.stopPropagation()
                e.preventDefault()
                
                var oldDiv = document.querySelector("#"+e.dataTransfer.getData('newdivID'))//取出并保存开始拖拽的div的id属性的div
                var pos=e.dataTransfer.getData("newdiv") // 取出并保存开始拖拽的div的backgroundPosition属性
                oldDiv.style.backgroundPosition=e.target.style.backgroundPosition//把准备松开到的div的backgroundPosition属性值传递给取出的那个旧div
                e.target.style.backgroundPosition=pos// 把取出的那个旧div的backgroundPosition属性值传递给当前准备松开到的div
            })
            v.addEventListener("dragover",function(e){
                e.preventDefault()
            })
})