在 JavaScript 中创建关联数组
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Creating associative arrays in JavaScript
提问by Metalshark
Using the following code:
使用以下代码：
$credits.getCredits = function() {
return $(this).find( 'tbody' ).children( 'tr' ).map(function(){
var $name = $(this).children(':first').html();
var $role = $(this).children(':nth-child(2)').html();
return { $role: $name };
}).get();
}
Which looks through the elements of a credits list and shouldreturn a listing like the following:
它查看信用列表的元素，并应返回如下所示的列表：
[
{ 'Make-up': 'Bob' },
{ 'Make-up': 'Susan' },
{ 'Photography': 'Charlie' },
{ 'Lighting': 'Mike' },
{ 'Props': 'One-handed Tony' }
]
It ends up outputting this instead:
它最终输出这个：
[
{ '$role': 'Bob' },
{ '$role': 'Susan' },
{ '$role': 'Charlie' },
{ '$role': 'Mike' },
{ '$role': 'One-handed Tony' }
]
How do you remedy the associative array creation to get the desired output?
您如何补救关联数组的创建以获得所需的输出？
回答by Felix Kling
Create the object (associative array) in two steps:
分两步创建对象（关联数组）：
var obj = {};
obj[$role] = $name;
return obj
Whenever you use literals to create an object ({foo: bar}), the key will also be taken literally and will not be evaluated.
每当您使用字面量创建对象 ( {foo: bar}) 时，键也将按字面意思使用，不会被计算。
回答by Nick Craver
You need to return it a little differently if you want a dynamic name, like this:
如果您想要一个动态名称，则需要稍微不同地返回它，如下所示：
$credits.getCredits = function() {
return $(this).find( 'tbody' ).children( 'tr' ).map(function(){
var $name = $(this).children(':first').html(),
$role = $(this).children(':nth-child(2)').html(),
result = {};
result[$role] = $name;
return result;
}).get();
}
You can try an example here(check the console). This is, well, just the way object literal syntax works. Since these are equivalent:
你可以在这里尝试一个例子（检查控制台）。这就是对象字面量语法的工作方式。由于这些是等效的：
object.propertyName
object["propertyName"]
You can assign via that same route.
您可以通过相同的路线进行分配。
回答by Mene
There are no associative arrays in JS. Just create a new object and assign like you want, e.g:
JS 中没有关联数组。只需创建一个新对象并根据需要进行分配，例如：
var $obj = {};
$obj.MakeUp = 'Bob';
