How to use layui to upload images

<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([&#39;laypage&#39;, &#39;layer&#39;, &#39;upload&#39;], 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: &#39;#upload&#39;
            , url: &#39;/upload/&#39; //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) {
                    $(&#39;#demo1&#39;).attr(&#39;src&#39;, result); //图片链接（base64）
                });
            }
            , done: function (res) {
                //如果上传失败
                if (res.code > 0) {
                    return layer.msg(&#39;上传失败&#39;);
                }
                //上传成功
            }
            , error: function () {
                //演示失败状态，并实现重传
                var demoText = $(&#39;#demoText&#39;);
                demoText.html(&#39;<span style="color: #FF5722;">上传失败</span> 
                <a class="layui-btn layui-btn-xs demo-reload">重试</a>&#39;);
                demoText.find(&#39;.demo-reload&#39;).on(&#39;click&#39;, function () {
                    uploadInst.upload();
                });
            }
        });
 }); 
</script>