更新前端静态网页获取方式，放弃使用后端获取api

frontend/node_modules/es-abstract/2021/DayWithinYear.js

@@ -0,0 +1,11 @@
+'use strict';
+
+var Day = require('./Day');
+var DayFromYear = require('./DayFromYear');
+var YearFromTime = require('./YearFromTime');
+
+// https://262.ecma-international.org/5.1/#sec-15.9.1.4
+
+module.exports = function DayWithinYear(t) {
+	return Day(t) - DayFromYear(YearFromTime(t));
+};