diff --git a/dist/js/dropify.js b/dist/js/dropify.js
index d7c3d4d..1fb8e2e 100644
--- a/dist/js/dropify.js
+++ b/dist/js/dropify.js
@@ -207,7 +207,7 @@ Dropify.prototype.readFile = function(input)
                 image.onload = function() {
                     _this.setFileDimensions(this.width, this.height);
                     _this.validateImage();
-                    _this.input.trigger(eventFileReady, [true, srcBase64]);
+                  	_this.input.trigger(eventFileReady, [_this.errorsEvent.errors.length === 0, srcBase64]);
                 };
 
             }.bind(this);
diff --git a/useage.md b/useage.md
new file mode 100644
index 0000000..08094ed
--- /dev/null
+++ b/useage.md
@@ -0,0 +1,58 @@
+html:
+
+```html
+<form id="avatarForm" class="change-avatar" enctype="multipart/form-data" 		action="${ctxPath}/home/profile/avatar" method="post">
+    <input 
+      id="avatarFile"
+      name="avatar"
+      type="file" class="dropify" 
+      class="dropify" 
+      data-max-width="1024"
+      data-max-height="1024"
+      data-max-file-size="2M"
+      data-default-file="${ctxPath }/home/profile/avatar.png" 
+      data-show-remove="false" 
+      data-allowed-file-extensions="jpg png gif"
+      data-height="128"/>
+    <button type="button" id="avatarBtn" class="pure-button button-success">修改头像</button>
+    <p>从电脑中选择图片上传, 图像大小不要超过 2 MB，长宽不要超过 1024 px</p>
+  </form>
+```
+
+
+
+js:
+
+```javascript
+	 	$('#avatarBtn').click(function() {
+			$("#avatarFile").trigger("click");
+		});
+		var drEvent = $('#avatarFile').dropify();
+		drEvent.on('dropify.fileReady', function(event, previewable, src){
+			if(previewable) {
+                // 提交表单
+		 		$(this).closest('form').submit(); 
+			} else {
+				dialog('图片格式有问题，请重新选择');
+			}
+		});
+
+        // 监听表单提交动作
+        $('#avatarForm').ajaxForm({
+			success: function(responseText, statusText) {
+				if (responseText === 'ok') {
+					tip('头像修改成功');
+					console.log($('#avatar-img'));
+					$('#avatar-img').attr('src','${ctxPath 	}/home/profile/avatar.png?'+Math.random());
+				} else {
+					dialog(responseText);
+				}
+			}
+		});
+```
+
+
+
+**注意：**
+
+> 这里添加了`dropify.fileReady`作为回调事件，`previewable`代表是否可以预览，`false`代表出现了错误，所以不能预览，建议`previewable==false`时不要提交表单操作。
\ No newline at end of file