怎么用layui实现图片上传

<div class="layui-upload upload">

            <button type="button" class="layui-form-label" id="upload">上传图片</button>

            　<input  class="layui-upload-file" type="file" accept="" name="file">

             <div class="layui-upload-list">

                   <img class="layui-upload-img" id="demo1">

                   <p id="demoText"></p>

             </div>

</div>

<script>

    layui.use(['laypage', 'layer', 'upload'], function () {

        var laypage = layui.laypage  //设置配置环境

            , layer = layui.layer

            , upload = layui.upload

        //上传图片

        var uploadInst = upload.render({

            elem: '#upload'

            , url: '/upload/' //改成您自己的上传接口

            , before: function (obj) {

                //预读本地文件示例，不支持ie8

                obj.preview(function (index, file, result) {

                    $('#demo1').attr('src', result); //图片链接（base64）

                });

            }

            , done: function (res) {

                //如果上传失败

                if (res.code > 0) {

                    return layer.msg('上传失败');

                }

                //上传成功

            }

            , error: function () {

                //演示失败状态，并实现重传

                var demoText = $('#demoText');

                demoText.html('<span style="color: #FF5722;">上传失败</span>

                <a class="layui-btn layui-btn-xs demo-reload">重试</a>');

                demoText.find('.demo-reload').on('click', function () {

                    uploadInst.upload();

                });

            }

        });

 });

</script>