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ES6 allows literals to be used when defining objects, using expressions as property names of objects

var lastWord = 'last word';

var a = {
  'first word': 'hello',
  [lastWord]: 'world'
};

a['first word'] // "hello"
a[lastWord] // "world"
a['last word'] // "world"

Answer after modifying the question description

The root of this problem is how to use a variable as a key when declaring an object

If the variable is a string or number

var o = {}; 
var a = 'aaa'; 

o[a] = '用變量的值做 key'; 

console.log(o); 

If the variable is an object

Then we need to use ES6 Map

Look at the code. It’s easy to understand. It’s a superset of the previous method

var key = { val: '我是對象 作為key' }; 

// 初始化一個 m  類比 s = new Object(); 
var m = new Map(); 
m.set(key, '被key射中（作為值'); 

ScreenShot

New writing method

const ob1 = {
    name: '辣條',
    color: '綠色',
    length: 10,
}
const ob2 = {
    name: '辣條',
    color: '黃色',
    length: 12,
}
const diff = diffObject(ob1, ob2)
console.log('diff[0]:', diff[0])
console.log('diff[1]:', diff[1])
//  diff[0]: [{color: '綠色'}, {length: 10,}]
//  diff[1]: [{color: '黃色'}, {length: 12,}]

Utilize reduce

var diffObj = (a, b) => (
    Object.keys(a).reduce((acc, key) => {
        if (a[key] !== b[key]){
            let temp = {}; 
            temp[key] = a[key]; 
            acc[0].push(temp);

            temp = {}; 
            temp[key] = b[key]; 
            acc[1].push(temp); 
            
            return acc; 
        } else {
            return acc; 
        }
    }, [[], []])
);

ScreenShot

Before modification

diffObject(a, b) {
    let before = [], after = []
    Object.keys(a).forEach(key => {
        if (a[key] !== b[key]) {
            before.push({ ??? }) // 這里應該怎么寫,{key: a[key]},但key不能是變量啊
            after.push({ ??? })
        }
    })
    return [before, after]
}

Achieved

Uh-huh. . After reading the problem description for a long time, I’m not quite sure what you want to do

Let’s guess based on the function name and before after. Do you want to put the different attributes and values ??of object a and object b into before and after respectively? If so, you can take a look at the code below

var diffObj = (a, b) => {
    let keys = []
      , vals = []; 
      
    Object.keys(a).forEach(key => {
        if (a[key] !== b[key]){
            keys.push(key); 
            vals.push({
                a: a[key],
                b: b[key]
            });
        }
    }); 
    
    return [keys, vals]; 
}

var xiaoMing = {
    name: '小明',
    area: 'sz',
    school: '●０●',
    age: 11 
}

var xiaoHong = {
    name: '小紅', 
    area: 'gz', 
    school: '(┬＿┬)',
    age: 11 
}

var diffs = diffObj(xiaoMing, xiaoHong); 

diffs[0].forEach((key, idx) => {
    console.group('Diff: ');
    console.log('key:', key, 'val:', diffs[1][idx]);
    console.groupEnd(); 
})

ScreenShot

Actually your question boils down to
this question:

function(value, key) {
    ret.push({key: value});
}

key will be parsed into a string "key", and the expectation is a variable key For example, when key="abc",value="123"
the above actually becomes {"key":"123"} It should be {"abc":"123"}
The most direct answer is var o = {}; o[key] = value; ret.push(o);
But is there a simpler way? method?

The following are the results of the discussion

@240 var a={},b=a[key]=value,c=ret.push(a);
@hotor var c;ret.push((c={},c[a]=b,c));
@Gaubee ret.push(eval("({"+key+":\""+value+"\"})"));
@hotor function(a,b,c){ret.push((c={},c[a]=b,c));}
@240 ret[ret.push({})-1][key]=value;
@Gaubee (ret[ret.length] = {})[key] = value;

Note: The above answers are listed in chronological order. None of them have been fully tried. Please test carefully before using them. The main thing is to learn the ideas.
As for which solution to choose, I hope to weigh it based on simplicity, performance and readability. Different people have different opinions

This is a summary of a discussion in a QQ group. I am just a porter.

ES6 supports object properties as variables, the writing method is:

var a = 'x'
var b = 'y'
var obj = {
  [a]: 'this is x',
  [b]: 'this is y',
}
console.log(obj)

In your push parameters, just use this writing method.