ajax 求數據 雙重for循環渲染數據

<!doctype html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport"
          content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
</head>
<body>
    <div class="box"></div>
    <script>

        var data = [
            {
                "content":"ffffffff ",
                "doctorAddress":"img/1.png",
                "doctorId":1,
                "doctorName":"楊小松",
                "img":[
                    {
                        "headId":1,
                        "imgAddress":"img/1.jpg",
                        "imgAddressId":1
                    },
                    {
                        "headId":1,
                        "imgAddress":"img/2.jpg",
                        "imgAddressId":2
                    }
                ],

            },
            {
                "content":"ffffffff",
                "doctorAddress":"img/1.png",
                "doctorId":1,
                "doctorName":"楊小松",
                "img":[
                    {
                        "headId":7,
                        "imgAddress":"img/2.jpg",
                        "imgAddressId":4
                    }
                ],

            }
        ];


        var box = document.getElementsByClassName('box')[0]
        var DOM = '';
        for (var i=0;i<data.length;i++){
            DOM += `
                <ul class="first">
                  <li>${data[i].doctorName}</li>
                  <li>`
                    for( var j = 0; j< data[i].img.length; j++) {
                        DOM += `
                            <p id="${data[i].img[j].imgAddressId}"></p>
                        `
                    }
            DOM +=`</li>
                </ul>
            `
        }
        box.innerHTML = DOM;


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

 

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