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Vou compartilhar aqui o código-fonte de um jogo-da-velha desenvolvido por alunos da Universidade de San Diego (UCSD).
Bom para perder algum tempo e também para analisar.
Até mais!
Bom para perder algum tempo e também para analisar.
Código HTML:
<html> <head> <title>Jogo da Velha</title> </head> <body> <script type="text/javascript"> <!-- step = 0; diff=3; // change board when button is clicked function clear_all(form) { step = 0; for (i=0;i<9; ++i) { position="a"+i; form[position].value=""; } } // change board when button is clicked function clickit(field) { if (step == -1) {alert("Reset e jogue novamente"); return;} position=field.name.substring(1,2,1); position = 'a'+position; if (field.form[position].value !="") {alert("Não pode mover pra cá"); return;} field.form[position].value="X"; if (eval_pos(field.form)) { field.form.output.value="Você venceu!!"; step = -1; return; } position=get_move(field.form); field.form.output.value='I moved to ' + position.substring(1,2,1); if (position=="") { field.form.output.value="Não houve vencedor."; step = -1; return; } field.form[position].value="O"; if (eval_pos(field.form)) { field.form.output.value="Você perdeu!"; step = -1; } } // see if there is a winner function eval_pos(form) { if ((form.a0.value!="" && form.a0.value==form.a3.value && form.a0.value==form.a6.value)|| (form.a0.value!="" && form.a0.value==form.a1.value && form.a0.value==form.a2.value) || (form.a0.value!="" && form.a0.value==form.a4.value && form.a0.value==form.a8.value) || (form.a1.value!="" && form.a1.value==form.a4.value && form.a1.value==form.a7.value) || (form.a2.value!="" && form.a2.value==form.a5.value && form.a2.value==form.a8.value) || (form.a2.value!="" && form.a2.value==form.a4.value && form.a2.value==form.a6.value) || (form.a3.value!="" && form.a3.value==form.a4.value && form.a3.value==form.a5.value) || (form.a6.value!="" && form.a6.value==form.a7.value && form.a6.value==form.a8.value)) return true; else return false; } function f(a) { if (a == "") return "."; else return a; } // get position for move. function comp_move(form,player,weight,depth) { var cost; var bestcost=-2; var position; var newplayer; if (player=="X") newplayer="O"; else newplayer="X"; if (depth==diff) return 0; if (eval_pos(form)) return 1; for (var i=0; i<9; ++i) { position='a'+i; if (form[position].value != "") continue; form[position].value=player; cost = comp_move(form,newplayer, -weight, depth+1); if (cost > bestcost) { bestcost=cost; if (cost==1) i=9; } form[position].value=""; } if (bestcost==-2) bestcost=0; return(-bestcost); } // get position for move. function get_move(form) { var cost; var bestcost=-2; bestmove=""; // don't think about first move. if (step++ == 0) if (form.a4.value=="") return "a4"; else if (form.a0.value=="") return "a0"; for (var i=0; i<9; ++i) { localposition='a'+i; if (form[localposition].value != "") continue; form[localposition].value="O"; cost=comp_move(form,"X", -1, 0); if (cost > bestcost) { if (cost==1) i=9; bestmove=localposition; bestcost=cost; } form[localposition].value=""; } return bestmove; } // complain if user attempts to change board function complain(field) { field.form.output.focus(); // put focus eleswhere alert("Clique no botão"); } //a href="http://www.ucsd.edu/ // the end --> </script> <form> <div align="center"><center><p><input type="text" size="1" name="a0" onfocus="complain(this)"> <input type="button" name="b0" onclick="clickit(this)"> <input type="text" size="1" name="a1" onfocus="complain(this)"> <input type="button" name="b1" onclick="clickit(this)"> <input type="text" size="1" name="a2" onfocus="complain(this)"> <input type="button" name="b2" onclick="clickit(this)"> <br> <input type="text" size="1" name="a3" onfocus="complain(this)"> <input type="button" name="b3" onclick="clickit(this)"> <input type="text" size="1" name="a4" onfocus="complain(this)"> <input type="button" name="b4" onclick="clickit(this)"> <input type="text" size="1" name="a5" onfocus="complain(this)"> <input type="button" name="b5" onclick="clickit(this)"> <br> <input type="text" size="1" name="a6" onfocus="complain(this)"> <input type="button" name="b6" onclick="clickit(this)"> <input type="text" size="1" name="a7" onfocus="complain(this)"> <input type="button" name="b7" onclick="clickit(this)"> <input type="text" size="1" name="a8" onfocus="complain(this)"> <input type="button" name="b8" onclick="clickit(this)"> <br> <br> <br> <font size="3" face="Comic Sans MS, arial">Mensagem: <input type="text" size="20" name="output"><br> <br> Nível de Dificuldade: <select name="difficulty" size="1" onchange="diff=form.difficulty[form.difficulty.selectedIndex].value;"> <option value="1"> Muito Fácil </option> <option value="2"> Fácil </option> <option selected value="3"> Médio </option> <option value="4"> Difícil </option> </select> </font></p> </center></div><div align="center"><center><p><font size="3" face="Comic Sans MS, arial"><input type="button" value="Computador Movendo Primeiro" onclick=" if (!step++) this.form.a4.value='O';"> </font></p> </center></div><div align="center"><center><p><font size="3" face="Comic Sans MS, arial"><input type="reset" value="Reiniciar" onclick="clear_all(this.form)"> </font></p> </center></div> </form> <p align="center"> </p> </body> </html>
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