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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Javascript是否具有关联数组?
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