js实现ctrl enter快捷键换行textarea

<textarea id="demo" rows="6" cols="35" onfocus="focusIng=true" onblur="focusIng=false"></textarea>

使用
原生js监听键盘点击事件，自定义组合键
中的快捷键方法

let pressedKeys = [];
let quickKeys = {
  send: 'enter',
  newline: 'control,enter',
}
let focusIng = false;
document.addEventListener("keydown", function (e) {
  if (e.key.toLowerCase() == 'enter') {
    if (focusIng) {
      e.preventDefault();
    }
  }
  if (!pressedKeys.includes(e.key.toLowerCase())) {
    pressedKeys.push(e.key.toLowerCase());
  }
});
document.addEventListener("keyup", function (e) {
  switch (pressedKeys.toString()) {
    case quickKeys.send:
      console.log('按下了 发送 快捷键');
      break;
    case quickKeys.newline:
      console.log('按下了 换行 快捷键');
      if(focusIng) {
        let elem = document.getElementById('demo');
        elem.value += '\n';
      }
      break;
  }
  pressedKeys = pressedKeys.filter((item, index, arr) => {
    return item != e.key.toLowerCase();
  });
  if(pressedKeys.length != 1 || pressedKeys[0] != 'control') {
    pressedKeys = [];
  }
});