用代码实现游戏应用中连续按键触发必杀技的监测方法

const skills = [  {    keys: ['ArrowUp', 'ArrowUp', 'ArrowDown', 'ArrowDown', 'ArrowLeft', 'ArrowRight', 'ArrowLeft', 'ArrowRight', 'b', 'a'],    cd: 10,    skillsCheckProgress: 0,    skillsLastFire: 0,  }]window.onkeydown = (key) => {  for (let i = 0; i < skills.length; i++) {    let skill = skills[i];    if (key.key === skill.keys[skill.skillsCheckProgress]) {      skill.skillsCheckProgress++;    } else {      skill.skillsCheckProgress = 0;    }    let now = new Date().getTime();    if (skill.skillsCheckProgress === skill.keys.length      && (now - skill.skillsLastFire) > (skill.cd * 1000)) {      skills.skillsCheckProgress = 0;      skills.skillsLastFire = now;      console.log('fire');    }  }}