diff --git a/zh-cn/application-dev/windowmanager/application-window-stage.md b/zh-cn/application-dev/windowmanager/application-window-stage.md
index 33fe1385b290ea4b51630d9152f6c3a8341db84d..4935e338065b354a75dff5e2b23674d2495badc2 100644
--- a/zh-cn/application-dev/windowmanager/application-window-stage.md
+++ b/zh-cn/application-dev/windowmanager/application-window-stage.md
@@ -350,7 +350,7 @@ class MainAbility extends Ability {
    class MainAbility extends Ability {
        onWindowStageCreate(windowStage) {
            // 2. 创建悬浮窗。
-           var windowClass = null;
+           var windowClass = [];
            window.create(this.context, "floatWindow", window.WindowType.TYPE_FlOAT, (err, data) => {
                if (err.code) {
                    console.error('Failed to create the floatWindow. Cause: ' + JSON.stringify(err));