WebUploader点击上传文件选择框会延迟几秒才会显示

 accept: {
     title: 'Images',
     extensions: 'jpg,jpeg,png',
     mimeTypes: 'image/*'
 }

改为

 accept: {
     title: 'Images',
     extensions: 'jpg,jpeg,png',
     mimeTypes: 'image/jpg,image/jpeg,image/png' //修改这行
 }