策略模式

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状态模式

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let ResultState = (() => {
  let States = {
    state0: function () {
      console.log("state0")
    },
    state1: function () {
      console.log("state1")
    },
    state2: function () {
      console.log("state2")
    },
    state3: function () {
      console.log("state3")
    },
  }

  function show(result) {
    States["state" + result] && States["state" + result]()
  }

  return {
    show,
  }
})()

// for test
ResultState.show(3)

策略模式

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let Price = (() => {
  let obj = {
    return30: (price) => +price + parseInt(price / 100) * 30,
    return50: (price) => +price + parseInt(price / 100) * 50,
    percent90: (price) => (price * 100 * 90) / 10000,
    percent80: (price) => (price * 100 * 80) / 10000,
  }
  return (algorithm, price) => {
    return obj[algorithm] && obj[algorithm](price)
  }
})()

// for test
let price = Price("return50", 321.13)
console.log(price)