从 Javascript 中的外部文件读取（没有 jQuery）答案

【问题标题】：Reading from an external file in Javascript (without jQuery)从 Javascript 中的外部文件读取（没有 jQuery）
【发布时间】：2012-02-04 22:37:43
【问题描述】：

我正在寻找一种方法来读取外部文本文件map.txt（分配在我自己的服务器中，而不是在客户端的计算机中）并将其中包含的数据存储在二维数组中map[][]使用 Javascript。

map.txt 文件将填充数字，并且它的每一行都有固定的长度：

21123301201200
12030201303321
22321321021312
12312310001230
12312321221220

所以，我希望它以map[0][0] = 2 和map[13][4] = 0（在此示例中）的方式将其存储在二维数组map 中。这甚至可能吗？如果是这样，它是如何完成的？

谢谢！

【问题讨论】：

您是在服务器端还是在客户端使用 Javascript？并且您希望服务器或客户端读取文件吗？
我在客户端使用 Javascript，我希望客户端读取文件（但文件本身是在服务器中分配的，而不是在客户端的计算机中）。

标签： javascript arrays file file-io multidimensional-array

【解决方案1】：

您可以使用XMLHttpRequest 来获取文件。看看：http://www.quirksmode.org/js/xmlhttp.html

并使用此函数创建数组：

function handleRequest(req){
    var a=req.responseText.split('\n');
    var len=a.length;
    for(var i=0;i<len;i++){
        a[i]=a[i].split('');
    }
    return a;
}

这个函数应该返回：

[["2","1","1","2","3","3","0","1","2","0","1","2","0","0"],
["1","2","0","3","0","2","0","1","3","0","3","3","2","1"],
["2","2","3","2","1","3","2","1","0","2","1","3","1","2"],
["1","2","3","1","2","3","1","0","0","0","1","2","3","0"],
["1","2","3","1","2","3","2","1","2","2","1","2","2","0"]]

使用map[4][13] 而不是map[13][4] 来获取示例中的最后一个元素

【讨论】：