Refactoring and add build-tools

src/utils/Url.js

@@ -0,0 +1,47 @@
+const INTERVAL_TIME = 100;
+
+export class UrlController {
+
+    constructor() {
+        this._changeListeners = [];
+        this._interval = null;
+        this._url = window.location.href;
+    }
+
+    onChange(cb) {
+        this._changeListeners.push(cb);
+        if (this._interval === null) {
+            this._createInterval();
+        }
+    }
+
+    removeEventListener(cb) {
+        this._changeListeners = this._changeListeners.filter(item=>item !== cb);
+        if(this._changeListeners.length === 0) {
+            this._clearInterval();
+        }
+    }
+
+    _intervalTick() {
+        const currentUrl = window.location.href;
+        if (currentUrl !== this.url) {
+            this._broadcast(this.url, currentUrl);
+            this.url = currentUrl;
+        }
+
+    }
+
+    _broadcast(oldUrl, newUrl) {
+        this._changeListeners.forEach(cb => cb(oldUrl, newUrl));
+    }
+
+    _createInterval() {
+        this.interval = setInterval(() => this._intervalTick(), INTERVAL_TIME)
+    }
+
+    _clearInterval() {
+        clearInterval(this.interval)
+        this.interval = null
+    }
+
+}

src/utils/getChatBody.js

@@ -0,0 +1,3 @@
+export function getChatBody() {
+    return document.getElementsByClassName("_im_peer_history im-page-chat-contain")[0];
+}