<script>
        window.onload = function () {
            var url = "data/init.json"/*json檔案url*/
            var request = new XMLHttpRequest();
            request.open("get", url);/*設定請求方法與路徑*/
            request.send(null);/*不傳送資料到伺服器*/
            request.onload = function () {/*XHR物件獲取到返回資訊後執行*/
                if (request.status == 200) {/*返回狀態為200，即為資料獲取成功*/
                    var json = JSON.parse(request.responseText);
                    console.log(json);
                }
            }
        }
 </script>