getJSON同步異步

<script type="text/javascript">
        function get_json() {
            $.ajaxSettings.async = false;//同步
            var json;
            $.getJSON("annual_info.json", function(data) {
                json = JSON.stringify(data);
            });
            $.ajaxSettings.async = true;//異步
            console.log(json);
            return json;
        }
        var rrr=get_json();
    </script>

JSON.stringify(data);json對象轉爲字符串；

JSON.parse(jsonString);json字符串轉爲json對象