document.addEventListener()

• keydown
• keyup
• mousedown
• mouseup
• mousemove

// 检测键盘按键
document.addEventListener("keydown",function(event){
    // 检测a(不是A)
    if(event.key == 'a'){
        console.log('a');
    }
});

// 检测鼠标移动
document.addEventListener("mousemove",function(event){
    console.log(event.clientX + " " + event.clientY)
})