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How to write a snake game using JS code (detailed tutorial)

亚连Original: 2018-06-12 14:41:151757browse

This article shares with you all the content of the classic Snake game using simple JS code. Friends who are interested can refer to it.

In the past, Nokia's Snake was all the rage. In an era when games were scarce, it was too difficult to implement using Java. Now, you can create a simple demo with just 20 lines of code to create a web page. Times are progressing

Full script code:

<!doctype html> 
<html> 
<body> 
 <canvas id="can" width="400" height="400" style="background: Black"></canvas> 
 <script> 
 var sn = [ 42, 41 ], dz = 43, fx = 1, n, ctx = document.getElementById("can").getContext("2d"); 
 function draw(t, c) { 
  ctx.fillStyle = c; 
  ctx.fillRect(t % 20 * 20 + 1, ~~(t / 20) * 20 + 1, 18, 18); 
 } 
 document.onkeydown = function(e) { 
  fx = sn[1] - sn[0] == (n = [ -1, -20, 1, 20 ][(e || event).keyCode - 37] || fx) ? fx : n 
 }; 
 !function() { 
  sn.unshift(n = sn[0] + fx); 
  if (sn.indexOf(n, 1) > 0 || n<0||n>399 || fx == 1 && n % 20 == 0 || fx == -1 && n % 20 == 19) 
  return alert("GAME OVER"); 
  draw(n, "Lime"); 
  if (n == dz) { 
  while (sn.indexOf(dz = ~~(Math.random() * 400)) >= 0); 
  draw(dz, "Yellow"); 
  } else 
  draw(sn.pop(), "Black"); 
  setTimeout(arguments.callee, 130); 
 }(); 
 </script> 
</body> 
</html>

The above is what I compiled for everyone. I hope it will be helpful to everyone in the future.

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