增加admin管理帐号和项目的界面--初步实现

frontend/node_modules/date-fns/getDecade.js

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+"use strict";
+exports.getDecade = getDecade;
+var _index = require("./toDate.js");
+
+/**
+ * @name getDecade
+ * @category Decade Helpers
+ * @summary Get the decade of the given date.
+ *
+ * @description
+ * Get the decade of the given date.
+ *
+ * @typeParam DateType - The `Date` type, the function operates on. Gets inferred from passed arguments. Allows to use extensions like [`UTCDate`](https://github.com/date-fns/utc).
+ *
+ * @param date - The given date
+ *
+ * @returns The year of decade
+ *
+ * @example
+ * // Which decade belongs 27 November 1942?
+ * const result = getDecade(new Date(1942, 10, 27))
+ * //=> 1940
+ */
+function getDecade(date) {
+  // TODO: Switch to more technical definition in of decades that start with 1
+  // end with 0. I.e. 2001-2010 instead of current 2000-2009. It's a breaking
+  // change, so it can only be done in 4.0.
+  const _date = (0, _index.toDate)(date);
+  const year = _date.getFullYear();
+  const decade = Math.floor(year / 10) * 10;
+  return decade;
+}