fix #216 with cookie mgmt.

src/utils/cookieUtil.js

@@ -0,0 +1,29 @@
+export function getCookie(name) {
+    const nameEQ = name + "=";
+    const ca = document.cookie.split(';');
+    for (let i = 0; i < ca.length; i++) {
+      let c = ca[i];
+      while (c.charAt(0) === ' ') {
+        c = c.substring(1, c.length);
+    }
+      if (c.indexOf(nameEQ) === 0) {
+        return c.substring(nameEQ.length, c.length);
+    }
+    }
+    return null;
+  }
+  
+ export function setCookie(name, value, days=1) {
+    let expires = "";
+    if (days) {
+      const date = new Date();
+      date.setTime(date.getTime() + (days * 24 * 60 * 60 * 1000));
+      expires = "; expires=" + date.toUTCString();
+    }
+    document.cookie = name + "=" + (value || "") + expires + "; path=/";
+  }
+
+  export function deleteCookie(name, path = '/') {
+    document.cookie = name + '=; Max-Age=-99999999; path=' + path;
+  }
+