更新前端静态网页获取方式，放弃使用后端获取api

frontend/node_modules/underscore/cjs/now.js

@@ -0,0 +1,6 @@
+// A (possibly faster) way to get the current timestamp as an integer.
+var now = Date.now || function() {
+  return new Date().getTime();
+};
+
+module.exports = now;