问如何使用ajax从Node.js中的路由中获取查询字符串中的数据？

EN

$(document).ready(function () {
$('#search').on('submit', function() {
    $.ajax({
        url: "http://localhost:8080/home/playback/json",
        contentType: "application/json",            
        dataType: 'json',
        success: function (data) {
            console.log(data);
        },error: function () {
            alert('error');
        },
        type: "GET",
    });
});
});

app.get('/home/playback', function (req, res) {
    res.render('playback.ejs');
});
app.get('/home/playback/json', function (req, res) {
    //database connection
    dbconnection.query("SELECT * FROM myTable WHERE FILE_NUM LIKE '%" + req.query.searchFileNumber + "%' LIMIT 5", function (err, rows, fields) { 
       if (err) throw err; //Show any errors
        var data = []; 
        for (i = 0; i < rows.length; i++) {
            data.push(rows[i]);
        }        
        res.json(data);
    });
});