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// ---- Make array

function MakeArray( n){ this.length = n;

for (var i = 1; i <= n; i++) {

this[i] = 0

}

return this

}

// ----- poor man's random number

var d0 = new Date();

var r0 = d0.getSeconds();

function poor_rand(){

d1 = new Date();

r0 = (r0 * r0 + r0 + d1.getSeconds()) % 3721 ;

return r0 % width_n;

}

// ---- Parameters of game

var height_n = 8;

var width_n =5;

// ---- state of game

var enemy = new MakeArray( width_n); // enemy positions

var wtime; // wait time

var score; // points

var gameover; // in case of gameover set to true

// ----- Make the battlefield.

document.write( "<FORM NAME='fm1'>");

document.write( "<INPUT TYPE='text' NAME='message' SIZE=20>");

document.write( "</FORM>");

document.write( "<FORM NAME='fm2'><TABLE>");

for( var i=0; i<height_n; i++){

document.write( "<TR>");

for( var j=0;j<width_n; j++){

document.write( "<TD><CENTER><INPUT TYPE='radio'></CENTER></TD>");

}

document.write( "</TR>");

}

document.write( "<TR>");

for( var j=0;j<width_n; j++){

document.write( "<TD><INPUT TYPE='button' VALUE='A' onClick='fire("

+ j + ")'></TD>");

}

document.write( "</TR>");

document.write( "</TABLE>");

document.write( "<INPUT TYPE='button' VALUE='START' onClick='game_start()'>");

document.write( "</FORM>");

// ----- game main timer event

// -----     enemy come one step

function come(){

var n = poor_rand();

document.fm2.elements[ width_n * enemy[n+1] + n].checked = true;

enemy[n+1]++;

if( enemy[n+1] < height_n){

setTimeout("come()", wtime);

}else{

gameover = true;

document.fm1.message.value =  "GAME OVER:" + score ;

}

// ----- Fire the n th beam

function fire( n){

if( gameover ) return;

for( var i=0; i<enemy[n+1]; i++){ // clear enemy

document.fm2.elements[ width_n * i + n].checked = false;

}

score += enemy[ n+1];

document.fm1.message.value = "Points:" + score;

enemy[ n+1] = 0;

if( wtime > 50){ wtime -= 10};

}

// ---- initialize & start game

function game_start(){

for( var n=0; n<width_n; n++){

for( var i=0; i<enemy[n+1]; i++){

document.fm2.elements[ width_n * i + n].checked = false;

}

enemy[n+1] = 0;

}

wtime = 150;

score = 0;

gameover = false;

document.fm1.message.value = "Points:" + score;

setTimeout("come()", wtime);

}

// -->

</SCRIPT>

</bady></html>

所属频道：游戏娱乐特效/更新时间：2013-05-04

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