Do not set same key \"[object Object]\" in wx:key. 使用控件 mp-uploader 当files参数大于1时，就会提示找个 错误消息

1.files.push( {url: 'xxx'} )

2.<mp-uploader bindfail="uploadError" bindsuccess="uploadSuccess" select="{{selectFile}}"

         upload="{{uplaodFile}}" files="{{files}}" max-count="{{ uploaderMaxCount }}" title="  微信截图" binddelete="deleteImg"

         showDelete="{{showImgDelete}}" > </mp-uploader>