使用Javascript检测按键组合系列

时间:2012-04-08 07:15:28

标签: javascript jquery javascript-events

对于复活节假期,我想在我开发的网站上有一个惊喜“复活节彩蛋”。我隐藏的这五个复活节彩蛋中的两个将是按键命令。这不会像“按CTRL和TAB同时”类型的交易,但将是“Pres up三次然后RIGHT三次”类型的事情。这将是寻找一系列按键而不是一次按下两个按键。我已经设置了这个功能,但由于一些奇怪的原因它不能正常工作。

注意:以下脚本正在寻找以下按键印章:
surprise1 - LEFT(x3),RIGHT(x3),UP(x3),DOWN(x3)
surprise2 - SHIFT(x3),TAB(x3),CTRL(x3)

$(document.body).keydown(function(e) {
            surprise1(e);
            surprise2(e);
});

function surprise1(e) {
    var ev = (e) ? e : window.event;
    var k = ev.keyCode;
    if (k > 36 && k < 41) {
        typekeys[k] = isNaN(typekeys[k]) ? 0 : typekeys[k];
        typekeys[k]++;
        if (typekeys[37] == 3) {
            if (typekeys[37] == 3 && typekeys[39] == 3) {
                if (typekeys[37] == 3 && typekeys[39] == 3 && typekeys[38] == 3) {
                    if (typekeys[37] == 3 && typekeys[39] == 3 && typekeys[38] == 3 && typekeys[40] == 3) {
                        alert("You've found Surprise 1! Contact the site admin ASAP to get your prize!");
                        typekeys[37] = typekeys[39] = typekeys[38] = typekeys[40] = 0;
                    }
                } else {
                    typekeys[40] = 0;
                }
            } else {
                typekeys[38] = typekeys[40] = 0;
            }
        } else {
            if (typekeys[37] > 3) {
                typekeys[37] = 0;
            }
            typekeys[39] = typekeys[38] = typekeys[40] = 0;
        }
    } else {
        typekeys[37] = typekeys[39] = typekeys[38] = typekeys[40] = 0;
    }
};

function surprise2(e) {
    var ev = (e) ? e : window.event;
    var k = ev.keyCode;
    if (k > 8 && k < 18) {
        typekeys[k] = isNaN(typekeys[k]) ? 0 : typekeys[k];
        typekeys[k]++;
        if (typekeys[16] == 3) {
            if (typekeys[9] == 3) {
                if (typekeys[16] == 3 && typekeys[9] == 3 && typekeys[17] == 3) {
                    alert("You've found Surprise 2! Contact the site admin ASAP to get your prize!");
                    typekeys[16] = typekeys[9] = typekeys[17] = 0;
                }
            }
        } else {
            if (typekeys[16] > 3) {
                typekeys[16] = 0;
            }
            typekeys[9] = typekeys[17] = 0;
        }
    } else {
        typekeys[16] = typekeys[9] = typekeys[17] = 0;
    }
};

请注意告诉我为什么不起作用?在我看来它应该有用。

4 个答案:

答案 0 :(得分:2)

试试这个:我正在使用https://github.com/madrobby/keymaster jquery插件

$(function () {
   var combination = ''
   key('left', function(){ 
       combination = 'left';
       checkCombination();
   });
   key('right', function(){ 
       combination+= 'right';
       checkCombination();
   });
   key('up', function(){ 
       combination+= 'up';
       checkCombination();
   });
   key('down', function(){ 
       combination+= 'down';
       checkCombination();
   });

   function checkCombination() {
      if(combination === 'leftrightupdown') {
        alert('surprise 1');  
      } 
   }
});​

演示:http://jsfiddle.net/codef0rmer/BSdCq/

答案 1 :(得分:1)

这是我的解决方案。我必须做一些有趣的事情来比较数组here。我相信你可以适应这个剧本的一般要点,以满足你的需求....

var seqs = [ [37,37,37,38,38,38,39,39,39,40,40,40], [9,9,9,16,16,16,17,17,17] ];
var seq  = [];

var messages=["You've found Surprise 1! Contact the site admin ASAP to get your prize!", "You've found Surprise 2! Contact the site admin ASAP to get your prize!"];

window.addEventListener("keydown", function(e){
    seq.push(e.keyCode);
    var eq = function(a,b){ return !( a<b || b<a ); };
    for ( var i = 0; i < seqs.length; i++ ) {
        if ( eq( seq, seqs[i].slice(0,seq.length) )) {
          if ( eq(seq, seqs[i]) ) {
            alert( messages[i] );
            seq = [];
          }
        return;
        }
    }
    seq = [];
});

答案 2 :(得分:1)

以下是我解决这个问题的方法......

var nums = [38, 38, 40, 40, 37, 39, 37, 39, 66, 65];
var n = nums.slice();
$(document).keydown(function(e){
  if(e.which == n[0]){
    n.shift();
  } else n = nums.slice();
  if(n.length == 0) {
    //success!
    n = nums.slice();
  }
});

如果您知道序列是什么,那就值得称道。 ;)

答案 3 :(得分:0)

这样更好:

$(function () {
  var combination = ''
   key('left', function(){ 
   combination = 'left';
   checkCombination();
 });
key('right', function(){ 
    combination+= 'right';
    checkCombination();
});
key('up', function(){ 
    combination+= 'up';
    checkCombination();
});
key('down', function(){ 
    combination+= 'down';
    checkCombination();
});

key(!'down' && !'left' && !'right' && !'up',function() {
    combination = '';
});

function checkCombination() {
   if(combination === 'leftrightupdown') {
     alert('surprise 1');  
   } 
}
});