layui上传控件传递参数 传参

//图片上传
var uploadInst = upload.render({
    elem: '#musicBtn'
    ,url: "{:url('uploadFile')}"
    ,acceptMime:'audio/mpeg'
    ,exts:'mp3'
    ,before: function (){
        this.data = {
            path: 'music'
        }
    }
    ,done: function(res){
        if(res.code == 1){
            $('#file_path').val(res.data.path);
            $('#imgText>img').attr('src','__IMG__/upload_video.jpg'); //图片链接（base64）
            $('#imgText>img').show();
            $('#imgText>p').html(res.msg);
        }else{
            layer.alert('上传失败！');
        }
    }
    ,error: function(){
        //预览失败状态，并实现重传
        var imgText = $('#imgText');
        imgText.html('<span style="color: #FF5722;">上传失败</span> <a class="layui-btn layui-btn-xs demo-reload">重试</a>');
        imgText.find('.demo-reload').on('click', function(){
            uploadInst.upload();
        });
    }
});