问查找一个二维数组在另一个二维数组中的所有匹配项

EN

var x = [[0,1,0,0,0,0,0],
        [1,1,1,0,0,1,0],
        [0,1,0,0,1,1,1],
        [0,0,0,0,0,1,0],
        [0,0,1,0,0,0,0],
        [0,1,1,1,0,0,0],
        [0,0,1,0,0,0,0]];

var y = [[0,1,0],[1,1,1],[0,1,0]];

var res = [];
for (var i = 0; i < x.length - y.length + 1; i++) {
    for (var k = 0; k < x[0].length - y[0].length + 1; k++) {
        var count = 0;
        for (var l = 0; l < y.length; l++) {
             for (var m = 0; m < y[l].length; m++) {
                count += Math.abs(y[l][m] - x[i + l][k + m]);
            }       
        }
        if (count === 0) {
            res.push([i, k]);
        }

    }
}