trans.user.js

// ==UserScript==
// @name         trans
// @match        *://*/*
// ==/UserScript==

let ctrlPressed = false

// 监听键盘按下事件
document.addEventListener('keydown', function(event) {
  // 按下 Ctrl,F 时, keyup 未检测到 Ctrl,F
  // 解: 其会出现 2 个连续 keydown 事件 (e.key17, e.ctrl&e.key70), 当检测到第二个事件时无效化第一个
  //console.log(event.keyCode)
  if(event.ctrlKey && event.keyCode === 70) {
    ctrlPressed = false
  }
  if (event.keyCode === 17) { // Ctrl 键被按下
    ctrlPressed = true
    setTimeout(function() {
      if (!ctrlPressed) return
      ctrlPressed = false
      console.log('超时已释放')
    }, 3000);
    //console.log(ctrlPressed)
  }
})

// 监听键盘释放事件
document.addEventListener('keyup', function(event) {
  //console.log(event.keyCode)
  if (event.keyCode === 17) {
    ctrlPressed = false
    //console.log(ctrlPressed)
  }
})

// 监听鼠标释放事件
document.addEventListener('mouseup', function(event) {
  let selection = window.getSelection().toString()
  if (!ctrlPressed)
    return
  if (selection !== '') {
    window.open("quicker:runaction:trans_cr?" + selection)
  } else { // 点击超链接时
    ctrlPressed = false
  }
})