chore: update demo

src/demo/data/bar.js

@@ -0,0 +1,45 @@
+function random() {
+  return Math.round(300 + Math.random() * 700) / 10;
+}
+
+export default function getData() {
+  return {
+    textStyle: {
+      fontFamily: 'Inter, "Helvetica Neue", Arial, sans-serif'
+    },
+    dataset: {
+      dimensions: ["Product", "2015", "2016", "2017"],
+      source: [
+        {
+          Product: "Matcha Latte",
+          "2015": random(),
+          "2016": random(),
+          "2017": random()
+        },
+        {
+          Product: "Milk Tea",
+          "2015": random(),
+          "2016": random(),
+          "2017": random()
+        },
+        {
+          Product: "Cheese Cocoa",
+          "2015": random(),
+          "2016": random(),
+          "2017": random()
+        },
+        {
+          Product: "Walnut Brownie",
+          "2015": random(),
+          "2016": random(),
+          "2017": random()
+        }
+      ]
+    },
+    xAxis: { type: "category" },
+    yAxis: {},
+    // Declare several bar series, each will be mapped
+    // to a column of dataset.source by default.
+    series: [{ type: "bar" }, { type: "bar" }, { type: "bar" }]
+  };
+}