Cómo obtener la versión de JavaScript y JScript

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//-------------------------------------------------------------------------------------------------- // Engines      JavaScript   1+ //              JScript      1+ // Environments NN2+ IE3+ WSH1+ MOZILLA1+ SAFARI1+ //--------------------------------------------------------------------------------------------------   // Global //--------------------------------------------------------------------------------------------------   function  __this() { return this; } var __g = __this();   //--------------------------------------------------------------------------------------------------   var __err_t = __g.Error; var __num_t = __g.Number; var __rex_t = __g.RegExp;   // JScript //--------------------------------------------------------------------------------------------------   var  __jsm_; /*@cc_on __jsm_ = @_jscript_version; @cc_off @*/       if (!__jsm_)      __jsm_ = __err_t ? 5 : (__rex_t ? 3 : (__num_t.MAX_VALUE ? 2 : 1));   // JavaScript //--------------------------------------------------------------------------------------------------   var __jsn_ = __err_t ? 1.5 : (__g.Infinity ? 1.3 : (__rex_t ? 1.2 : (__num_t.MAX_VALUE ? 1.1 : 1)));   if (__jsn_ == 1.5)     __jsn_ = eval('[]').reduce ? 1.8 : (__g.Iterator ? 1.7 : (eval('[]').map ? 1.6 : 1.5));