render function

Author: yyx990803

src/api/render-function.md

@@ -10,6 +10,40 @@
 
 ## resolveComponent()
 
+<div class="composition-api">
+
+```js
+const { h, resolveComponent } = Vue
+
+export default {
+  setup() {
+    const ButtonCounter = resolveComponent('ButtonCounter')
+
+    return () => {
+      return h(ButtonCounter)
+    }
+  }
+}
+```
+
+</div>
+<div class="options-api">
+
+```js
+const { h, resolveComponent } = Vue
+
+export default {
+  render() {
+    const ButtonCounter = resolveComponent('ButtonCounter')
+    return h(ButtonCounter)
+  }
+}
+```
+
+</div>
+
+Note that `resolveComponent()` must be called inside<span class="composition-api">either `setup()` or</span> the render function in order to resolve from the correct component context.
+
 ## resolveDirective()
 
 ## withDirectives()