Javascript 关联数组声明单行中的动态键
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Dynamic keys in Javascript associative array declaration one-liner
提问by ajwood
I would expect the following three associative arrays to be identical:
我希望以下三个关联数组是相同的：
arr1 = { "dynamic":"foo", "bar":"baz" };
key = "dynamic";
arr2 = { key:"foo", "bar":"baz" };
arr3 = {};
arr3[key] = "foo";
arr3["bar"] = "baz";
In the above examples, arr1and arr3are the same, but arr2is different.
在上面的例子中，arr1和arr3是相同的，但是arr2是不同的。
Is it possible to use dynamic keys in the declaration of a javascript associative array?
是否可以在 javascript 关联数组的声明中使用动态键？
采纳答案by ThiefMaster
Only the []syntax works for dynamic keys. You cannot use them in a literal. So your answer is no, it's not possible.
只有[]语法适用于动态键。你不能在文字中使用它们。所以你的答案是否定的，这是不可能的。
But you can use a literal to create all the static keys and then add the dynamic ones using the []syntax. That's usually prettier than using the .or []notation for allelements.
但是您可以使用文字来创建所有静态键，然后使用[]语法添加动态键。这通常比对所有元素使用.or[]符号更漂亮。
回答by Brian
It is nowpossible to use dynamic keys in the declaration of a javascript object, in any browser/platform that supports ES6 literal shorthands:
这是现在可以在JavaScript对象的声明使用动态密钥，在任何浏览器/平台，支持ES6文字速记：
key = "dynamic";
arr2 = {
[key]: "foo", // "dynamic": "foo"
"bar": "baz"
};
回答by Ramasamy Kasi
I found a solution for this.
我为此找到了解决方案。
Do as following:
执行以下操作：
var field='name';
var ourVar={};
ourVar[field] = 'Somethig';
回答by Phil M
Since you asked for a one liner, try this:
既然你要求单衬，试试这个：
var key = 'dynamic', obj = (function(o) { o[key]='foo'; return o;})({bar: 'baz'});
This will make objequal to {bar: "baz", dynamic: "foo"}
这将obj等于{bar: "baz", dynamic: "foo"}
回答by Vladimir Monsanto
var originalObj = {};//some data here
function addKeyValuePair(originalObj,key,value){
originalObj = {...originalObj,[key]:value}
};
