Javascript是否具有关联数组?

问题描述

Javascript是否具有关联数组?请解释.

Does Javascript have associative arrays? Please explain.

推荐答案

不； JavaScript数组只是数字键和混合值.使用对象可以达到相同的目的(或者，实际上，它与其他语言中的关联数组完全相同):

Nope; JavaScript arrays are just numeric keys and mixed values. The same thing can be achieved (or, actually, it's exactly the same as associative arrays in other languages) with objects:

var foo = {
  a: 123,
  b: 'CDE'
};

foo.a; // 123
foo['a']; // 123

您可以使用数组:

var foo = [];
foo.a = 123;
foo.b = 'CDE';

foo.b; // CDE
foo['b']; // CDE

但是，应该永远不要这样做，因为这不会将键/值对输入到数组中，而是将它们作为属性添加到数组对象中. (此外，{a: 123}比a = []; a.a = 123容易).如果需要键/值对，请使用对象".如果需要枚举列表，请使用数组.

HOWEVER, this should never be done because this will not enter the key/value pairs into the array, but add them to the array object as properties. (besides, {a: 123} is easier than a = []; a.a = 123) If you need key/value pairs, use Objects. If you need an enumerated list, use arrays.

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