diff --git a/docs/uni-app-x/dom/README.md b/docs/uni-app-x/dom/README.md
index b543156e265ab9be2c6e1cb8ddde8d586bc0a335..bf490835313fc4f72e1c234717eef07db104efda 100644
--- a/docs/uni-app-x/dom/README.md
+++ b/docs/uni-app-x/dom/README.md
@@ -199,7 +199,7 @@ DrawableContext 在调用 API 之后不会主动更新到画布上，需要主
 <script>
 	export default {
 		onReady() {
-			var ctx = (this.$refs['drawable'] as Element.getDrawableContext()
+			var ctx = (this.$refs['drawable'] as Element).getDrawableContext()
 			ctx.moveTo(50, 40);
 			ctx.lineTo(200, 40);
 			ctx.stroke();