Javascript 将动态键：值对传递给对象文字？
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Passing in dynamic key:value pairs to an object literal?
提问by cube
I am using this slice of code (shown below) in an attempt to populate the object literal named Parametersinside the for loop. I need the key:valuepair to be assigned in conjunction with the loops iterating ivariable, as such: {key_1:chunks[1],key_2:chunks[2]}. However, my code isn't working. The 'key_'+iis not being reflected in the literal.
我正在使用这段代码（如下所示）来尝试填充Parameters在 for 循环中命名的对象文字 。我需要key:value在与环结合迭代将被分配一对i变量，因为这样的：{key_1:chunks[1],key_2:chunks[2]}。但是，我的代码不起作用。的'key_'+i没有被反映在字面。
There's something I am missing here, obviously. Can someone tell me what it is?...Thanks.
显然，我在这里缺少一些东西。有人能告诉我它是什么吗？...谢谢。
var Parameters=[];
var len = chunks.length;
for (var i = 0; i < len; i++) {
var key='key_'+i
obj= { key : chunks[i]};
Parameters.push(obj)
}
回答by meder omuraliev
EDIT: Use var obj = {}; obj[key] = chunks[i];
编辑：使用 var obj = {}; obj[key] = chunks[i];
Because ECMAScript treats the keyin this {key:1}as literal.
因为 ECMAScript 将keythis 中的{key:1}视为文字。
回答by Paul Tyng
ES2015 (via Babel) Supports dynamic keys:
ES2015（通过 Babel）支持动态键：
const Parameters=[];
const len = chunks.length;
for (let i = 0; i < len; i++) {
const key = `key_${i}`;
obj = { [key] : chunks[i]};
Parameters.push(obj);
}
(note the brackets around the key)
（注意键周围的括号）
Or better yet:
或者更好：
const Parameters = chunks.map((c, i) => ({ [`key_${i}`]: c }));
回答by Soman Dubey
same can be used for lookup: obj[key] . Do remmeber obj.key will look for key in object
同样可用于查找： obj[key] 。请记住 obj.key 将在对象中查找键
var obj = {
test:1
}
var key = 'test'
obj.test = obj[key] = 1
Here obj.key will not work
这里 obj.key 不起作用
