javascript - 是否可以在对象声明中使用变量的值作为对象键？

Question

我想按照这些思路做一些事情:

var firstName = "alan";
var secondName = "antonella";
var statusOfPeople = {
    firstName: "excellent",
    secondName: "superb"
};
console.log(JSON.stringify(statusOfPeople));

并得到这个输出:

{ "alan": "excellent", "antonella": "superb" }

这可能吗？不这样做？

var statusOfPeople = {};
statusOfPeople[firstName] = "excellent";
statusOfPeople[secondName] = "superb";

Answer 1

不，不是直接在对象字面量声明中。

无法判断您是打算将变量值还是标识符本身作为属性名称。

---

如果需要，您可以创建一个接受键/值对数组的辅助函数:

function makeObject() {
    var obj = {};
    for( var i = 0; i < arguments.length; ++i ) {
        obj[ arguments[i][0] ] = arguments[i][1];
    }
    return obj;
}

像这样使用它:

var firstName = "alan";
var secondName = "antonella"; 

var statusOfPeople = makeObject(
    [firstName, "excellent"],
    [secondName, "superb"]
);

console.log(JSON.stringify(statusOfPeople)); 

// {"alan":"excellent","antonella":"superb"}

---

如果你这样做，你甚至可以减少语法:

function makeObject() {
    var obj = {};
    for( var i = 0; i < arguments.length; i+=2 ) {
        obj[ arguments[i] ] = arguments[i+1];
    }
    return obj;
}

然后像这样使用它:

var firstName = "alan";
var secondName = "antonella"; 

var statusOfPeople = makeObject(
    firstName, "excellent",
    secondName, "superb"
);

console.log(JSON.stringify(statusOfPeople)); 

// {"alan":"excellent","antonella":"superb"}