一次按下的javascript多个按键出现错误

Question

$(document).keydown(function(e){ 
    var key=e.which; 
    //to prevent reversing, add the possible value of d which hinders the snake to go to desired direction 
    if(key=="37"&&d!="right"){ 
     if(p==true){ 
      clearInterval(game_loop); 
      game_loop=setInterval(paint,60); 
      p=false; 
      d="left"; 
     } 
     else{ 
      d="left"; 
     } 
    } 
    else if(key=="38"&&d!="down"){ 
     if(p==true){ 
      clearInterval(game_loop); 
      game_loop=setInterval(paint,60); 
      p=false; 
      d="up"; 
     } 
     else{ 
      d="up"; 
     } 
    } 
    else if(key=="39"&&d!="left"){ 
     if(p==true){ 
      clearInterval(game_loop); 
      game_loop=setInterval(paint,60); 
      p=false; 
      d="right"; 
     } 
     else{ 
      d="right"; 
     } 
    } 
    else if(key=="40"&&d!="up"){ 
     if(p==true){ 
      clearInterval(game_loop); 
      game_loop=setInterval(paint,60); 
      p=false; 
      d="down"; 
     } 
     else{ 
      d="down"; 
     } 
    } 
    else if(key=="32"){ 
     if(p==false){ 
      clearInterval(game_loop); 
      p=true; 
     } 
     else{ 
      game_loop=setInterval(paint,60); 
      p=false; 
     } 
    } 
}) 

此代码定义了我的蛇的我的keydown。问题是。每当我同时按下2个键，或者如果我按下并快速离开（也许其他组合也是可能的），游戏结束了。我的功能检查碰撞到自己的身体后，我快速按下2键后返回true像下来，离开..

它怎么fixeD？

Answer 1

你试过e.preventDefault（）..

$(document).keydown(function(e){ 
    var key=e.which; 
    e.preventDefault();