射击小游戏

好好玩玩吧!

脚本说明:
第一步:把如下代码加入<body>区域中
 <SCRIPT LANGUAGE="JavaScript">
 
 
 // ---- 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>

第二步:把<body>区域中的内容改为:
<BODY bgcolor="#fef4d9" onLoad="document.forms[0].guess.focus(); document.forms[0].guess.select()">