Question

我有一个像这样的对象

{"first":["first 1"],"second":["second 1","second 2"],"third":["third 1", "third 2"]}

我希望能够根据变量值更改属性名称。如果变量是＆＃34;第二个＆＃34;它应该将属性改为我想要的任何东西。我尝试了一些方法......

这个

object[theVariable] = "new second";

会将属性的值更改为此

{"first":["first 1"],"second":"new second","third":["third 1", "third 2"]}

这个

object.theVariable = "new second";

将创建一个像这样的新属性

{"first":["first 1"],"second":["second 1","second 2"],"third":["third 1", "third 2"],"theVariable":"new second"}

这些方法都不会改变属性＆＃34; second＆＃34;到＆＃34;新的第二＆＃34;什么时候＆＃34;秒＆＃34;存储在变量＆＃34; theVariable＆＃34;

中

期望的结果：

{"first":["first 1"],"new second":["second 1","second 2"],"third":["third 1", "third 2"]}

如何做到这一点？

Answer 1

如果我理解正确，您想要更改对象中属性的名称。这应该有用。

 double TotalEarnings = 0.0d;
_SortedList.AsParallel().WithDegreeOfParallelism(5).ForAll(item => {
 TotalEarnings += Convert.ToDouble(item.SaleEarning);
 });

Answer 2

＆＃13;

var obj = {"first":["first 1"],"second":["second 1","second 2"],"third":["third 1", "third 2"]};

var theVariable = "new second";

obj[theVariable] = obj.second;
delete obj.second;

console.log(obj);

＆＃13;

Answer 3

通过括号表示法使用属性访问：

    var obj = {
      "first":["first 1"],
      "second":["second 1","second 2"],
      "third":["third 1", "third 2"]
    };
    console.log(obj);
    var propNameVariable = "second";
    obj[propNameVariable] = "new second";
    console.log(obj);

根据变量更改对象属性

3 个答案: