验证图片不为空

<div class="form-group" id="imgBox"> <label class="col-sm-2 control-label">上传图片：</label> <div class="ys-upImg-list"> <div class="ys-upImg"> <img src="{$info.images1 ?? ''}" alt="上传图片" class="upImg" /> <input type="file" name="images[]" class="imgInp" /> </div></div</div>         

 

 var pic= $(".ys-upImg img").attr("src");

if (pic == '') { parent.alertMsg('图片不能为空', 'alert-danger');return false;}