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32 lines (25 loc) · 410 Bytes

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32 lines (25 loc) · 410 Bytes

輸出

2
2
undefined
const obj = {
  value: 1,
  hello: function() {
    console.log(this.value)
  },
  inner: {
    value: 2,
    hello: function() {
      console.log(this.value)
    }
  }
}
  
const obj2 = obj.inner
const hello = obj.inner.hello

obj.inner.hello() # obj.inner.hello.call(obj.inner) = 2
obj2.hello() # obj2.hello.call(obj2) = 2
hello() # hello.call() = undefined