[Other] Refactor js submodule (#415)

* Refactor js submodule

* Remove change-log

* Update ocr module

* Update ocr-detection module

* Update ocr-detection module

* Remove change-log

examples/application/js/package/packages/paddlejs-models/mobilenet/src/index.ts

@@ -0,0 +1,58 @@
+/**
+ * @file mobilenet model
+ */
+
+import { Runner, env } from '@paddlejs/paddlejs-core';
+import '@paddlejs/paddlejs-backend-webgl';
+
+interface ModelConfig {
+    path: string;
+    mean?: number[];
+    std?: number[];
+    needPreheat?: boolean;
+}
+
+interface MobilenetMap {
+    [key: string]: string
+}
+
+let mobilenetMap = null as any;
+let runner = null as Runner;
+
+export async function load(config: ModelConfig, map: string[] | MobilenetMap) {
+    mobilenetMap = map;
+
+    const {
+        path,
+        mean,
+        std,
+        needPreheat = true
+    } = config;
+
+    runner = new Runner({
+        modelPath: path,
+        fill: '#fff',
+        mean: mean || [],
+        std: std || [],
+        scale: 256,
+        needPreheat
+    });
+    env.set('webgl_pack_channel', true);
+    await runner.init();
+}
+
+// 获取数组中的最大值索引
+function getMaxItem(datas: number[] = []) {
+    const max: number = Math.max.apply(null, datas);
+    const index: number = datas.indexOf(max);
+    return index;
+}
+
+
+export async function classify(image) {
+    const res = await runner.predict(image);
+    const maxItem = getMaxItem(res);
+    const result = mobilenetMap[`${maxItem}`];
+    return result;
+}
+