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get

简介

get 方法用于获取状态机当前的状态。

语法

stateMachine.get()

参数

该方法不接受任何参数。

返回值

返回值为当前状态机的状态,如果状态机还没有设置过状态,则返回 undefined

使用示例

const states = {
  idle: 'Idle State',
  running: 'Running State',
  stopped: 'Stopped State'
};

const transitions = [
  { name: 'start', from: 'idle', to: 'running' },
  { name: 'stop', from: 'running', to: 'stopped' },
  { name: 'restart', from: 'stopped', to: 'running' }
];

const stateMachine = new StateMachine({ states, transitions });

console.log(stateMachine.get()); // Output: undefined

stateMachine.start();

console.log(stateMachine.get()); // Output: Running State

stateMachine.stop();

console.log(stateMachine.get()); // Output: Stopped State

在上面的代码中,我们首先定义了状态集合 states 和状态转换集合 transitions

然后我们创建了一个状态机 stateMachine

我们调用 get 方法,发现状态机还没有设置过状态,返回 undefined

接着我们调用 start 方法来设置状态机的状态为 running

我们再次调用 get 方法,返回值为 Running State

最后我们调用 stop 方法来将状态机的状态设置为 stopped

我们再次调用 get 方法,返回值为 Stopped State

参考链接