alert without jquery

js/src/dom/data.js

@@ -0,0 +1,51 @@
+/**
+ * --------------------------------------------------------------------------
+ * Bootstrap (v4.0.0-beta): dom/data.js
+ * Licensed under MIT (https://github.com/twbs/bootstrap/blob/master/LICENSE)
+ * --------------------------------------------------------------------------
+ */
+
+const mapData = (() => {
+  const storeData    = {}
+  return {
+    set(element, key, data) {
+      let id
+      if (element.key === undefined) {
+        element.key = {
+          key,
+          id
+        }
+      }
+
+      storeData[id] = data
+    },
+    get(element, key) {
+      if (element.key === undefined || element.key !== key) {
+        return null
+      }
+      const keyProperties = element.key
+      return storeData[keyProperties.id]
+    },
+    delete(element, key) {
+      if (element.key === undefined || element.key !== key) {
+        return
+      }
+      const keyProperties = element.key
+      delete storeData[keyProperties.id]
+    }
+  }
+})()
+
+const Data = {
+  setData(instance, key, data) {
+    mapData.set(instance, key, data)
+  },
+  getData(instance, key) {
+    mapData.get(instance, key)
+  },
+  removeData(instance, key) {
+    mapData.delete(instance, key)
+  }
+}
+
+export default Data