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object_setDefault

If object does not have key, add it.

此脚本不应直接安装。它是供其他脚本使用的外部库，要使用该库请加入元指令 // @require https://update.cn-greasyfork.org/scripts/427473/937466/object_setDefault.js 

  1. // ==UserScript==
  2. // @name         object_setDefault
  3. // @namespace    bo.gd.an[at]rambler.ru
  4. // @version      0.5
  5. // @description  If object does not have key, add it.
  6. // @author       Bogudan
  7. // @license      LGPLv3
  8. // ==/UserScript==
  9.  
  10. (function () {
  11.     function setDefault (key, value) {
  12.         if (!(key in this))
  13.             this [key] = value;
  14.         }
  15.     Object.defineProperty (Object.prototype, 'setDefault', {
  16.         get : () => setDefault,
  17.         set : () => {},
  18.         });
  19.     }) ();