FineReport内置方法-https://help.fanruan.com/finereport/doc-view-622.html

试下

var url="www.baidu.com ";  接口URL地址

        var t ="具体内容";

        console.info(t);

        s=JSON.parse(t);

        var msg="";

             var xhr1 = new XMLHttpRequest();

        var xhr = new XMLHttpRequest();

            xhr.open('POST', url, true);

            xhr.send();

            xhr.onreadystatechange = function () {

                if (xhr.readyState == 4 && xhr.status == 200) {

                    //callback(xhr.responseText);

                    xhr1.open('POST', url, true);

                    xhr1.send(t);

                }

            };

        xhr1.onreadystatechange = function () {

            console.info(xhr1.readyState);

            console.info(xhr1.status);

            if (xhr1.readyState == 4 && xhr1.status == 200) {

                msg=JSON.parse(xhr1.responseText);

                alert(msg.payload.std_data.execution.description);

            }

        };