Machine.js 可以让你使用分层状态机来控制 JavaScript 对象。

 // the landscape object - rains or is sunny  function Landscape() {      this.groundwater = 0;      this.oxygen = 0;  }  Landscape.prototype = {      hasWater: function() { return this.groundwater > 0; },        giveWater: function() {          this.groundwater -= 1;          return 1;      },        oxygenate: function() { this.oxygen += 1; },  };

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