<SCRIPT LANGUAGE="JavaScript">
<!-- 
function MakeArray(n){
     this.length = n;                     
     for (var i = 1; i <= n; i++) {       
         this[i] = 0 
     }
     return this
}

var d0 = new Date();
var rand_0 = d0.getSeconds();                   
function p_rand(){                               
     d1 = new Date();                               
     rand_0 = (rand_0 * rand_0 + rand_0 + d1.getSeconds()) % 3721 ;
     return rand_0 % width_n;
}
 
var height_n = 7;           
var width_n =4;              

var enemy = new MakeArray(width_n);  
var wtime;                    
var score;
var gameover;
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='||' onClick='fire(" + j + ")'></TD>");
}
document.write( "</TR>");
document.write( "</TABLE>");
document.write( "<INPUT TYPE='button' VALUE='开始' onClick='game_start()'>");     
document.write( "</FORM>");
 
function ncome(){
     var n = p_rand();
     document.fm2.elements[width_n * enemy[n+1] + n].checked = true;
     enemy[n+1]++;
     if(enemy[n+1] < height_n){         
         setTimeout("ncome()", wtime);
     }else{
       gameover = true;                                     
       document.fm1.message.value =  "游戏结束:" + score ;  
     }
}

function fire(n){
     if(gameover) return;                 
     for(var i=0; i<enemy[n+1]; i++){
         document.fm2.elements[ width_n * i + n].checked = false;
     }
     score+= enemy[n+1];
     document.fm1.message.value = "分数:" + score;     
     enemy[ n+1] = 0;
     if( wtime > 50){ wtime -= 10};
}

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 = "分数:" + score;
     setTimeout("ncome()", wtime);
} 
//-->
</SCRIPT>