diff --git a/examples/docs/en-US/collapse.md b/examples/docs/en-US/collapse.md
index b0bfdad4b..42c53c0c2 100644
--- a/examples/docs/en-US/collapse.md
+++ b/examples/docs/en-US/collapse.md
@@ -59,6 +59,11 @@ You can expand multiple panels
       return {
         activeNames: ['1']
       };
+    },
+    methods: {
+      handleChange(val) {
+        console.log(val);
+      }
     }
   }
 </script>
diff --git a/examples/docs/es/collapse.md b/examples/docs/es/collapse.md
index ff3d259e0..70cb714d2 100644
--- a/examples/docs/es/collapse.md
+++ b/examples/docs/es/collapse.md
@@ -59,6 +59,11 @@ Puede expandir varios paneles
       return {
         activeNames: ['1']
       };
+    },
+    methods: {
+      handleChange(val) {
+        console.log(val);
+      }
     }
   }
 </script>
diff --git a/examples/docs/zh-CN/collapse.md b/examples/docs/zh-CN/collapse.md
index 8c0771de2..20795efba 100644
--- a/examples/docs/zh-CN/collapse.md
+++ b/examples/docs/zh-CN/collapse.md
@@ -58,6 +58,11 @@
       return {
         activeNames: ['1']
       };
+    },
+    methods: {
+      handleChange(val) {
+        console.log(val);
+      }
     }
   }
 </script>