pre标签模拟输入

let input = iframeDoc.querySelector('pre.edit[contenteditable="true"]')
      await sleep(300)
      await simulateHumanInputAwait(input, "你好")

async function simulateHumanInput(target, value, interval = 80) {
  target.focus()
  target.innerText = ""

  for (let i = 0; i < value.length; i++) {
    const char = value[i]
    target.innerText += char

    // 生成输入事件
    const inputEvent = new InputEvent("input", {
      bubbles: true,
      data: char,
      inputType: "insertText"
    })
    target.dispatchEvent(inputEvent)

    // 键盘事件
    const keyEventDown = new KeyboardEvent("keydown", {
      key: char,
      bubbles: true
    })
    const keyEventUp = new KeyboardEvent("keyup", { key: char, bubbles: true })
    target.dispatchEvent(keyEventDown)
    target.dispatchEvent(keyEventUp)

    await sleep(interval + Math.random() * 30)
  }

  target.blur()
}