映射与字符串键，其中值是一对长的数组在Javascript中

Question

我正在与Javascript数据结构作斗争。我需要创建一个映射，其中键是字符串，值是两个长数组。

例如:

var x = myMap["SomeString"];
var firstLong = x[0][0];
var secondLong = x[0][1];
// do something with first and second long
firstLong = x[1][0];
secondLong = x[1][1];
// do something with first and second long
etc..

如何在Javascript中正确实现这一点?

Answer 1

因此，为了使用多维数组，首先需要"定义"维度，即

var myMap = {};
myMap["SomeString"] = [];
myMap["SomeString"][0] = [];   // new dimension
myMap["SomeString"][0][0] = 1; // can be also done with
myMap["SomeString"][0][1] = 2; // myMap["SomeString"][0].push(2);
myMap["SomeString"][1] = [];   // new dimension
myMap["SomeString"][1][0] = 3;
myMap["SomeString"][1][1] = 4;

同样可以使用literal:

var myMap = {
    SomeString: [
        [1, 2],
        [3, 4]
    ]
};
console.log(myMap["SomeString"][0][1]);  // 2

Answer 2

javascript中的字典等效数据结构是javascript的基本对象。你可以试试

var myMap = {
    SomeString : [
        [1,2],
        [32222,44444]
    ]
}

Answer 3

假设你指的不是2d数组;

var myMap = {};
myMap["SomeString"] = [123, 456];
alert( myMap["SomeString"][0] );
alert( myMap["SomeString"][1] );