如果有人需要简单的解决方案。

let keys = [];
document.addEventListener("keydown", (e) => {
  keys.push(e.key);
  if (keys.includes("Control") && keys.includes("o")) {
    console.log("open");
  }

  if (keys.includes("Control") && keys.includes("s")) {
    console.log("save");
  }
});

// clear the keys array
document.addEventListener("keyup", () => {
  keys = [];
});

我会试着在按键时添加一个按键事件处理程序。例句:

window.onkeydown = function() {
    // evaluate key and call respective handler
    window.onkeypress = function() {
       // evaluate key and call respective handler
    }
}

window.onkeyup = function() {
    window.onkeypress = void(0) ;
}

这只是为了说明一个模式;这里我就不详细介绍了(尤其是浏览器特定的level2+事件注册)。

请回复这是否有帮助。

使keydown甚至调用多个函数，每个函数检查特定的键并适当地响应。

document.keydown = function (key) {

    checkKey("x");
    checkKey("y");
};

我喜欢使用这个片段，它对于编写游戏输入脚本非常有用

var keyMap = [];

window.addEventListener('keydown', (e)=>{
    if(!keyMap.includes(e.keyCode)){
        keyMap.push(e.keyCode);
    }
})

window.addEventListener('keyup', (e)=>{
    if(keyMap.includes(e.keyCode)){
        keyMap.splice(keyMap.indexOf(e.keyCode), 1);
    }
})

function key(x){
    return (keyMap.includes(x));
}

function checkGameKeys(){
    if(key(32)){
        // Space Key
    }
    if(key(37)){
        // Left Arrow Key
    }
    if(key(39)){
        // Right Arrow Key
    }
    if(key(38)){
        // Up Arrow Key
    }
    if(key(40)){
        // Down Arrow Key
    }
    if(key(65)){
        // A Key
    }
    if(key(68)){
        // D Key
    }
    if(key(87)){
        // W Key
    }
    if(key(83)){
        // S Key
    }
}

只是让某些东西更稳定:

var keys = [];
$(document).keydown(function (e) { 
    if(e.which == 32 || e.which == 70){
    keys.push(e.which);
    if(keys.length == 2 && keys.indexOf(32) != -1 && keys.indexOf(70) != -1){
        
        
        
        alert("it WORKS !!"); //MAKE SOMETHING HERE---------------->
        
        
        
        keys.length = 0;
    }else if((keys.indexOf(32) == -1 && keys.indexOf(70) != -1) || (keys.indexOf(32) != -1 && keys.indexOf(70) == -1) && (keys.indexOf(32) > 1 || keys.indexOf(70) > 1)){
    }else{
        keys.length = 0;
    }
}else{
    keys.length = 0;
}
});

Easiest, and most Effective Method

//check key press
    function loop(){
        //>>key<< can be any string representing a letter eg: "a", "b", "ctrl",
        if(map[*key*]==true){
         //do something
        }
        //multiple keys
        if(map["x"]==true&&map["ctrl"]==true){
         console.log("x, and ctrl are being held down together")
        }
    }

//>>>variable which will hold all key information<<
    var map={}

//Key Event Listeners
    window.addEventListener("keydown", btnd, true);
    window.addEventListener("keyup", btnu, true);

    //Handle button down
      function btnd(e) {
      map[e.key] = true;
      }

    //Handle Button up
      function btnu(e) {
      map[e.key] = false;
      }

//>>>If you want to see the state of every Key on the Keybaord<<<
    setInterval(() => {
                for (var x in map) {
                    log += "|" + x + "=" + map[x];
                }
                console.log(log);
                log = "";
            }, 300);