我试图找出为什么我编写的底部函数无法正常工作。每当我尝试测试它时,都会收到以下错误: Uncaught ReferenceError :后缀操作中的左侧表达式无效。我假设这是因为在添加 x 的值时,一旦去掉了引号,代码就无法将“x”字符串识别为与变量 x 相同。有人可以帮助我巧妙地使其发挥作用吗?如果没有,您能建议一些替代方法吗?提前致谢!
var grid = [[null, null, null],
[null, null, null],
[null, null, null]];
function checkWin() {
vals = ["x", "o"];
var x = 0;
var o = 0;
for (var k = 0; k < vals.length; k++) {
var value = vals[k];
for (var i = 0; i < 3; i++) {
if (grid[i][i] === value) {
(value.replace(/['"]+/g, '')) ++;
}
if (grid[2 - i][i] === value) {
(value.replace(/['"]+/g, '')) ++;
}
for (var j = 0; j < 3; j++) {
if (grid[i][j] === value) {
(value.replace(/['"]+/g, '')) ++;
}
if (grid[j][i] === value) {
(value.replace(/['"]+/g, '')) ++;
}
}
}
}
if (x === 3) {
alert("X wins!");
} else if (o === 3) {
alert("O wins!");
}
}
最佳答案
下面使用对象。测试了不同的网格定义
var grid = [
["o", "x", "x"],
["o", "x", "x"],
["o", "", "o"]];
var grid = [
["o", "x", ""],
["x", "x", "x"],
["o", "o", ""]];
var grid = [
["x", "x", ""],
["o", "x", "o"],
["o", "o", "x"]];
var grid = [
["x", "x", "o"],
["x", "o", "x"],
["o", "x", "x"]];
checkWin(grid)
function checkWin(grid) {
var vals = [{player: "x", value: 0}, {player: "o", value: 0}];
for (var k = 0; k < vals.length; k++) {
for (var i = 0; i < 3; i++) {
// check win by row
vals[k].value = 0;
// check win by col
for (var j = 0; j < 3; j++) {
if (grid[i][j] === vals[k].player) {
vals[k].value++;
}
}
if (vals[k].value === 3) {
alert(vals[k].player + " wins by row " + (i+1));
return vals[k].player;
}
// check win by col
vals[k].value = 0;
for (var j = 0; j < 3; j++) {
// check col
if (grid[j][i] === vals[k].player) {
vals[k].value++;
if (vals[k].value === 3) {
// break if you want to know what column won by
break;
}
}
}
if (vals[k].value === 3) {
alert(vals[k].player + " wins by col " + (i+1));
return vals[k].player;
}
}
}
// check win by diag l to r
for (var k = 0; k < vals.length; k++) {
vals[k].value = 0;
for (var i = 0; i < 3; i++) {
if (grid[i][i] === vals[k].player) {
vals[k].value++;
}
}
if (vals[k].value === 3) {
alert(vals[k].player + " wins by diag left to right!");
return vals[k].player;
}
}
// check win by diag r to l
for (var k = 0; k < vals.length; k++) {
vals[k].value = 0;
for (var i = 0; i < 3; i++) {
if (grid[i][2-i] === vals[k].player) {
vals[k].value++;
}
}
if (vals[k].value === 3) {
alert(vals[k].player + " wins by diag right to left!");
return vals[k].player;
}
}
}
关于javascript - 左侧表达式无效,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/40034400/