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请写出用户点击后输出结果

输出结果

<body>
  <div id="i" />
</body>

<script>
  document.body.addEventListener(
    'mousedown',
    () => {
      console.log('key1')
    },
    true
  )

  document.getElementById('i').addEventListener(
    'mousedown',
    () => {
      console.log('key2')
    },
    true
  )

  document.body.addEventListener(
    'mousedown',
    () => {
      console.log('key3')
    },
    false
  )

  document.getElementById('i').addEventListener(
    'mousedown',
    () => {
      console.log('key4')
    },
    false
  )
</script>

控制台打印结果

key1
key2
key4
key3