layui框架下图片上传、预览，html+javaScript

1、单图片预览上传

---

<div class="layui-upload">
  <button type="button" class="layui-btn" id="test1">上传图片</button>
  <div class="layui-upload-list">
    <img class="layui-upload-img" id="demo1">
    <p id="demoText"></p>
  </div>
  <div style="width: 95px;">
    <div class="layui-progress layui-progress-big" lay-showpercent="yes" lay-filter="demo">
      <div class="layui-progress-bar" lay-percent=""></div>
    </div>
  </div>
</div>    

 

  var uploadInst = upload.render({
    elem: '#test1