4．检查哪方胜利的程序

检查哪方胜利的程序如下：

function check_win(row, col, val) {

    var i = col, count = 0;

    // 先检查行连成四子

    while (_root.chess[row][i] == val and i>=0) {

             count++;

             i--;

    }

    if (count>=4) {

             return true;

    }

    i = col+1;

    while (_root.chess[row][i] == val and i<=6) {

             count++;

             i++;

    }

    if (count>=4) {

             return true;

    }

    // 再检查列连成四子

    count = 0;

    i = row;

    while (_root.chess[i][col] == val and i<=5) {

             count++;

             i++;

    }

    if (count>=4) {

             return true;

    }

    // 检查左高斜线

    count = 0;

    i = row;

    j = col;

    while (_root.chess[i][j] == val and i>=0 and j>=0) {

             count++;

             i--;

             j--;

    }

    if (count>=4) {

             return true;

    }

    i = row+1;

    j = col+1;

    while (_root.chess[i][j] == val and i<=5 and j<=6) {

             count++;

             i++;

             j++;

    }

    if (count>=4) {

             return true;

    }

    // 检查右高斜线

    count = 0;

    i = row;

    j = col;

    while (_root.chess[i][j] == val and i>=0 and j<=6) {

             count++;

             i--;

             j++;

    }

    if (count>=4) {

             return true;

    }

    i = row+1;

    j = col-1;

    while (_root.chess[i][j] == val and i<=5 and j>=0) {

             count++;

             i++;

             j--;

    }

    if (count>=4) {

             return true;

    }

}