1

对于JavaScript中数组中的数组（如下），为什么我不能像这样循环？

for (var i = 0, len= animation.length;i <len; i++) {
    for ( h = 0, len2= animation[i].length;h <len2; h++) {
            animation[i][h][0]=animation[i][h][0]*30;
            animation[i][h][1]=animation[i][h][1]*30;
    }
}
 document.write(animation);

编辑））））））））））））））））））））））））） 原因？这是因为我无意中将我的 json 数据变成了 var=animation; 变成一个字符串，一个看起来像数组的字符串。感谢您的帮助，很抱歉给您带来麻烦

样本“多维”数组：

[
    [
        [17, 28, 1, "z"],
        [18, 55, 2, "r"],
        [11, 36, 2, "r"],
        [18, 39, 2, "r"],
        [18, 39, 2, "r"],
        [24, 36, 2, "r"],
        [18, 36, 2, "r"],
        [23, 36, 2, "r"],
        [12, 35, 2, "r"],
        [24, 34, 2, "r"],
        [18, 27, 8, "r"],
        [17, 28, 4, "r"],
        [18, 2, 6, "b"],
        [24, 15, 6, "b"],
        [18, 15, 6, "b"],
        [18, 15, 6, "b"],
        [12, 15, 6, "b"],
        [24, 21, 6, "b"],
        [17, 21, 6, "b"],
        [18, 24, 6, "b"],
        [18, 24, 6, "b"],
        [28, 31, 6, "b"],
        [8, 29, 6, "b"]
    ],
    [
        [19, 28, 1, "z"],
        [18, 56, 2, "r"],
        [11, 35, 2, "r"],
        [18, 38, 2, "r"],
        [18, 38, 2, "r"],
        [23, 35, 2, "r"],
        [19, 35, 2, "r"],
        [23, 35, 2, "r"],
        [13, 35, 2, "r"],
        [23, 35, 2, "r"],
        [19, 28, 8, "r"],
        [17, 27, 4, "r"],
        [18, 1, 6, "b"],
        [23, 16, 6, "b"],
        [18, 16, 6, "b"],
        [19, 16, 6, "b"],
        [13, 16, 6, "b"],
        [23, 22, 6, "b"],
        [17, 22, 6, "b"],
        [17, 25, 6, "b"],
        [19, 25, 6, "b"],
        [27, 32, 6, "b"],
        [9, 28, 6, "b"]
    ],
    [
        [17, 26, 1, "z"],
        [18, 56, 2, "r"],
        [11, 35, 2, "r"],
        [18, 37, 2, "r"],
        [18, 37, 2, "r"],
        [23, 35, 2, "r"],
        [20, 35, 2, "r"],
        [23, 35, 2, "r"],
        [14, 35, 2, "r"],
        [23, 35, 2, "r"],
        [19, 28, 8, "r"],
        [16, 26, 4, "r"],
        [18, 1, 6, "b"],
        [22, 17, 6, "b"],
        [17, 17, 6, "b"],
        [18, 17, 6, "b"],
        [14, 17, 6, "b"],
        [23, 23, 6, "b"],
        [18, 23, 6, "b"],
        [16, 26, 6, "b"],
        [20, 26, 6, "b"],
        [26, 33, 6, "b"],
        [10, 28, 6, "b"]
    ],
    [
        [15, 24, 1, "z"],
        [18, 56, 2, "r"],
        [11, 34, 2, "r"],
        [18, 36, 2, "r"],
        [18, 36, 2, "r"],
        [23, 34, 2, "r"],
        [21, 34, 2, "r"],
        [23, 34, 2, "r"],
        [15, 34, 2, "r"],
        [22, 34, 2, "r"],
        [18, 27, 8, "r"],
        [15, 25, 4, "r"],
        [18, 1, 6, "b"],
        [22, 18, 6, "b"],
        [16, 18, 6, "b"],
        [17, 18, 6, "b"],
        [15, 18, 6, "b"],
        [22, 24, 6, "b"],
        [18, 24, 6, "b"],
        [15, 27, 6, "b"],
        [21, 27, 6, "b"],
        [25, 34, 6, "b"],
        [11, 28, 6, "b"]
    ],
    [
        [13, 22, 1, "z"],
        [18, 56, 2, "r"],
        [11, 33, 2, "r"],
        [18, 35, 2, "r"],
        [18, 35, 2, "r"],
        [23, 33, 2, "r"],
        [22, 33, 2, "r"],
        [23, 33, 2, "r"],
        [16, 33, 2, "r"],
        [21, 33, 2, "r"],
        [17, 26, 8, "r"],
        [14, 24, 4, "r"],
        [18, 1, 6, "b"],
        [21, 19, 6, "b"],
        [17, 19, 6, "b"],
        [16, 19, 6, "b"],
        [16, 19, 6, "b"],
        [22, 25, 6, "b"],
        [19, 25, 6, "b"],
        [14, 28, 6, "b"],
        [22, 28, 6, "b"],
        [24, 35, 6, "b"],
        [12, 28, 6, "b"]
    ],
    [
        [11, 22, 1, "z"],
        [18, 56, 2, "r"],
        [10, 34, 2, "r"],
        [18, 34, 2, "r"],
        [18, 34, 2, "r"],
        [23, 34, 2, "r"],
        [23, 34, 2, "r"],
        [23, 34, 2, "r"],
        [17, 34, 2, "r"],
        [20, 32, 2, "r"],
        [16, 25, 8, "r"],
        [13, 23, 4, "r"],
        [18, 1, 6, "b"],
        [20, 20, 6, "b"],
        [18, 18, 6, "b"],
        [17, 20, 6, "b"],
        [15, 20, 6, "b"],
        [21, 26, 6, "b"],
        [18, 25, 6, "b"],
        [13, 29, 6, "b"],
        [23, 29, 6, "b"],
        [23, 34, 6, "b"],
        [13, 28, 6, "b"]
    ],
    [
        [11, 22, 1, "z"],
        [18, 56, 2, "r"],
        [9, 33, 2, "r"],
        [18, 33, 2, "r"],
        [18, 33, 2, "r"],
        [23, 33, 2, "r"],
        [23, 33, 2, "r"],
        [23, 33, 2, "r"],
        [18, 33, 2, "r"],
        [19, 31, 2, "r"],
        [15, 24, 8, "r"],
        [12, 22, 4, "r"],
        [18, 1, 6, "b"],
        [19, 21, 6, "b"],
        [17, 19, 6, "b"],
        [16, 21, 6, "b"],
        [14, 21, 6, "b"],
        [22, 27, 6, "b"],
        [18, 26, 6, "b"],
        [12, 30, 6, "b"],
        [23, 30, 6, "b"],
        [22, 33, 6, "b"],
        [14, 28, 6, "b"]
    ],
    [
        [11, 22, 1, "z"],
        [18, 56, 2, "r"],
        [8, 34, 2, "r"],
        [18, 32, 2, "r"],
        [18, 32, 2, "r"],
        [23, 34, 2, "r"],
        [23, 34, 2, "r"],
        [23, 34, 2, "r"],
        [19, 34, 2, "r"],
        [18, 30, 2, "r"],
        [14, 23, 8, "r"],
        [11, 22, 4, "r"],
        [18, 1, 6, "b"],
        [18, 22, 6, "b"],
        [18, 18, 6, "b"],
        [15, 22, 6, "b"],
        [13, 22, 6, "b"],
        [23, 28, 6, "b"],
        [18, 27, 6, "b"],
        [11, 31, 6, "b"],
        [23, 31, 6, "b"],
        [23, 34, 6, "b"],
        [15, 28, 6, "b"]
    ],
    [
        [9, 20, 1, "z"],
        [18, 56, 2, "r"],
        [9, 33, 2, "r"],
        [18, 31, 2, "r"],
        [18, 31, 2, "r"],
        [23, 33, 2, "r"],
        [23, 33, 2, "r"],
        [23, 33, 2, "r"],
        [20, 33, 2, "r"],
        [17, 29, 2, "r"],
        [13, 22, 8, "r"],
        [10, 21, 4, "r"],
        [18, 1, 6, "b"],
        [17, 23, 6, "b"],
        [19, 19, 6, "b"],
        [14, 22, 6, "b"],
        [12, 21, 6, "b"],
        [22, 29, 6, "b"],
        [18, 28, 6, "b"],
        [10, 32, 6, "b"],
        [23, 32, 6, "b"],
        [22, 33, 6, "b"],
        [16, 28, 6, "b"]
    ],
    [
        [9, 20, 1, "z"],
        [18, 56, 2, "r"],
        [8, 34, 2, "r"],
        [18, 30, 2, "r"],
        [18, 30, 2, "r"],
        [23, 34, 2, "r"],
        [23, 34, 2, "r"],
        [23, 34, 2, "r"],
        [21, 34, 2, "r"],
        [16, 28, 2, "r"],
        [12, 21, 8, "r"],
        [9, 20, 4, "r"],
        [18, 1, 6, "b"],
        [18, 24, 6, "b"],
        [18, 18, 6, "b"],
        [13, 21, 6, "b"],
        [11, 20, 6, "b"],
        [23, 30, 6, "b"],
        [18, 29, 6, "b"],
        [11, 31, 6, "b"],
        [23, 33, 6, "b"],
        [23, 34, 6, "b"],
        [17, 28, 6, "b"]
    ],
    [
        [11, 22, 1, "z"],
        [18, 56, 2, "r"],
        [9, 33, 2, "r"],
        [18, 29, 2, "r"],
        [18, 29, 2, "r"],
        [23, 33, 2, "r"],
        [23, 33, 2, "r"],
        [23, 33, 2, "r"],
        [22, 33, 2, "r"],
        [15, 27, 2, "r"],
        [11, 20, 8, "r"],
        [8, 20, 4, "r"],
        [18, 1, 6, "b"],
        [18, 25, 6, "b"],
        [19, 18, 6, "b"],
        [12, 20, 6, "b"],
        [11, 20, 6, "b"],
        [23, 31, 6, "b"],
        [17, 28, 6, "b"],
        [10, 32, 6, "b"],
        [23, 33, 6, "b"],
        [22, 33, 6, "b"],
        [18, 28, 6, "b"]
    ]
]
4

2 回答 2

3

您对两个循环使用相同的长度变量。不能保证嵌套数组与外部数组的长度相同。它应该看起来更像这样：

for (var i = 0, len= animation.length;i <len; i++) {
    for ( h = 0, len2= animation[i].length;h <len2; h++) {
            animation[i][h][0]=animation[i][h][0]*30;
            animation[i][h][1]=animation[i][h][1]*30;
    }
}
于 2013-06-06T22:32:25.873 回答
0

发布代码时，请仅发布一个演示问题的最小示例。此外，发布可以在不修改的情况下复制、粘贴和运行的完整代码，否则您的问题可能会丢失在帖子的缺失部分中。

以下显示您发布的代码有效。但是没有任何东西可以将其链接到您发布的（过多的）数据。

var animation = 
[
    [
        [17, 28, 1, "z"],
        [28, 31, 6, "b"],
        [8, 29, 6, "b"]
    ],
    [
        [19, 28, 1, "z"],
        [17, 25, 6, "b"],
        [19, 25, 6, "b"],
        [27, 32, 6, "b"],
        [9, 28, 6, "b"]
    ]
]

for (var i = 0, len= animation.length;i <len; i++) {
    for ( h = 0, len2= animation[i].length;h <len2; h++) {
            animation[i][h][0]=animation[i][h][0]*30;
            animation[i][h][1]=animation[i][h][1]*30;
    }
}

document.write(animation);
于 2013-06-06T23:19:55.973 回答