代码如下：
<script name="JavaScript"> function variables(){ t = 1; change = 1; empty1 = -1; empty2 = -1; empty3 = -1; empty4 = -1; empty5 = -1; empty6 = -1; empty7 = -1; empty8 = -1; empty9 = -1; return; whogoesnow = "轮到：玩家一" } function win(){ if (empty1==empty2 && empty2==empty3 && empty3==0 || empty4==empty5 && empty5==empty6 && empty6==0 || empty7==empty8 && empty8==empty9 && empty9==0 || empty1==empty4 && empty4==empty7 && empty7==0 || empty2==empty5 && empty5==empty8 && empty8==0 || empty3==empty6 && empty6==empty9 && empty9==0 || empty1==empty5 && empty5==empty9 && empty9==0 || empty3==empty5 && empty5==empty7 && empty7==0 ){ alert ("玩家二，你嬴了!!!"); history.go(0) } if (empty1==empty2 && empty2==empty3 && empty3==1 || empty4==empty5 && empty5==empty6 && empty6==1 || empty7==empty8 && empty8==empty9 && empty9==1 || empty1==empty4 && empty4==empty7 && empty7==1 || empty2==empty5 && empty5==empty8 && empty8==1 || empty3==empty6 && empty6==empty9 && empty9==1 || empty1==empty5 && empty5==empty9 && empty9==1 || empty3==empty5 && empty5==empty7 && empty7==1 ){ alert ("玩家一，你嬴了!!!"); history.go(0) } } function turnchange(t){ if (change == 1) { if (t == 0){ t = 1; whogoesnow = "轮到：玩家" + '一' } else { t = 0; whogoesnow = "轮到：玩家" + '二' } } else { t = t; } change = 1 return (t); } function changing(clicked){ if (clicked == 1){ spot = empty1 ;} if (clicked == 2){ spot = empty2 ;} if (clicked == 3){ spot = empty3 ;} if (clicked == 4){ spot = empty4 ;} if (clicked == 5){ spot = empty5 ;} if (clicked == 6){ spot = empty6 ;} if (clicked == 7){ spot = empty7 ;} if (clicked == 8){ spot = empty8 ;} if (clicked == 9){ spot = empty9 ;} if (spot == -1){ if (t == 0){ xo = " O " ; spot = 0 } else { xo = " X " ; spot = 1 } if (clicked == 1){ empty1 = spot;} if (clicked == 2){ empty2 = spot ;} if (clicked == 3){ empty3 = spot ;} if (clicked == 4){ empty4 = spot ;} if (clicked == 5){ empty5 = spot ;} if (clicked == 6){ empty6 = spot ;} if (clicked == 7){ empty7 = spot ;} if (clicked == 8){ empty8 = spot ;} if (clicked == 9){ empty9 = spot ;} } else { if (spot == 0){ xo = " O ";} if (spot == 1){ xo = " X ";} change = 0 } return (xo) ; } function change_b1(form){ clicked = 1; changing(clicked) ; t = turnchange(t) ; form.b1.value = xo; form.whoseturn.value = whogoesnow win(); return; } function change_b2(form){ clicked = 2; changing(clicked) ; form.b2.value = xo; t = turnchange(t) ; form.whoseturn.value = whogoesnow win(); return; } function change_b3(form){ clicked = 3; changing(clicked) ; form.b3.value = xo; t = turnchange(t) ; form.whoseturn.value = whogoesnow win(); return; } function change_b4(form){ clicked = 4; changing(clicked) ; form.b4.value = xo; t = turnchange(t) ; form.whoseturn.value = whogoesnow win(); return; } function change_b5(form){ clicked = 5; changing(clicked) ; form.b5.value = xo; t = turnchange(t) ; form.whoseturn.value = whogoesnow win(); return; } function change_b6(form){ clicked = 6; changing(clicked) ; form.b6.value = xo; t = turnchange(t) ; form.whoseturn.value = whogoesnow win(); return; } function change_b7(form){ clicked = 7; changing(clicked) ; form.b7.value = xo; t = turnchange(t) ; form.whoseturn.value = whogoesnow win(); return; } function change_b8(form){ clicked = 8; changing(clicked) ; form.b8.value = xo; t = turnchange(t) ; form.whoseturn.value = whogoesnow win(); return; } function change_b9(form){ clicked = 9; changing(clicked) ; form.b9.value = xo; t = turnchange(t) ; form.whoseturn.value = whogoesnow win(); return; } </script> <script name="JavaScript"> variables(); </script> <font color="red"> <p align="center">Tic Tac Toe</font> 双人版</p> <form> <p><input type="button" name="whoseturn" value="轮到: 玩家一"> <br> <br> <br> <br> </p> <table> <tr> <td><input type="button" name="b1" value=" " onClick="change_b1(this.form)"> </td> <td><input type="button" name="b2" value=" " onClick="change_b2(this.form)"> </td> <td><input type="button" name="b3" value=" " onClick="change_b3(this.form)"> </td> </tr> <tr> <td><input type="button" name="b4" value=" " onClick="change_b4(this.form)"> </td> <td><input type="button" name="b5" value=" " onClick="change_b5(this.form)"> </td> <td><input type="button" name="b6" value=" " onClick="change_b6(this.form)"> </td> </tr> <tr> <td><input type="button" name="b7" value=" " onClick="change_b7(this.form)"> </td> <td><input type="button" name="b8" value=" " onClick="change_b8(this.form)"> </td> <td><input type="button" name="b9" value=" " onClick="change_b9(this.form)"> </td> </tr> </table> <p><br> <br> <br> <input TYPE="button" VALUE="新游戏" onClick="history.go(0)"> </p> </form>