写了个函数，输入三个参数，前两个参数传给url， 通过get请求，获取发票信息对象，第三个参数判断要获取的信息，从然后返回对应的值。

同事点拨，这样写效率低，直接返回对象，用的时候现取，不需要在函数中返回值。果然沟通使人进步。 改进后的代码：

function getInvocieInfo(user_id, taskid) {
    var invoiceObj = {};
    $.ajax({
        type: 'GET',
        dataType: 'json',
        url: 'http://180ly66419.iok.la:5000/api/detect_in?1=1&user_id=' + user_id + '&task_id=' + taskid,
        async: false,
        timeout: 5,
        data: {
            q: "select * from json where url=\"http://www.w3dev.cn/json.asp\"",
            format: "json"
        },
        success: function (response) {
            responseData = JSON.stringify(response);
            invoiceObj = eval('(' + responseData + ')');
        },
        error: function () {
            alert('服务器异常，获取发票信息失败！');
        }
    });
    return invoiceObj
}

使用的时候调用：

var inoviceObj = getInvocieInfo(user_id, taskList[i]);
invoiceInfo["invoiceTextID"]  = inoviceObj.data["invoice_code"];
invoiceInfo["invoiceTextNum"]  = inoviceObj.data["invoice_num"];

修改前

function getInvocieInfo(user_id, taskid, textInvocetype) {
    $.ajax({
        type: 'GET',
        dataType: 'json',
        url: 'http://180ly66419.iok.la:5000/api/detect_in?1=1&user_id=' + user_id + '&task_id=' + taskid,
        async: false,
        timeout: 5,
        data: {
            q: "select * from json where url=\"http://www.w3dev.cn/json.asp\"",
            format: "json"
        },
        success: function (response) {
            responseData = JSON.stringify(response);
            var invoiceObj = eval('(' + responseData + ')');
            invoiceID = invoiceObj.data['invoice_code'];
            invoiceNo = invoiceObj.data['invoice_num'];
        },
        error: function () {
            alert('服务器异常，获取发票信息失败！');
        }
    });
    if (textInvocetype == "textInvoiceNum") {
        return invoiceNo;
    }
    else if (textInvocetype == "textInvoiceID") {
        return invoiceID;
    }
}