用可变属性名构造JS对象的简写方式 [英] Shorthand way to construct JS object with variable property name

问题描述

是否有一种快捷方式来创建具有属性字段变量的对象?

Is there a shorthand way to create an object with a property field variable?

假设我有变量 PROP.Todo.PRIORITY = 'priority' 然后使用 Backbone 在这个例子中，我想保存这个属性，我怎样才能避免创建一个新的对象，将其分配给某个变量，然后设置属性?

Say I have the variable PROP.Todo.PRIORITY = 'priority' and then, using Backbone in this example, I want to save this property, how can I avoid having to create a new object, assigning it to some variable and then set the property?

我想实现这一目标:

var tmpObj = {};
tmpObj[PROP.Todo.PRIORITY] = "high";
this.model.save(tmpObj);

我试过这样的事情，但没有成功:

I've tried something like this, which was unsuccessful:

this.model.save(({}[PROP.Todo.PRIORITY] = "high"));

有什么建议吗?否则，我将编写大量长篇对象声明.

Any suggestions? I'm going to be writing a lot of long-hand object declarations otherwise.

推荐答案

如果你只是想要更简单的方法来创建对象，使用辅助函数怎么样?

If you just want an easier way to create the object, how about using a helper function?

function obj(prop, value) {
  var o = {};
  o[prop] = value;
  return o;
}

this.model.save(obj(PROP.Todo.PRIORITY, "high"));

我不确定我是否理解您问题的后半部分:

I'm not sure I understand the latter part of your question:

否则我将创建大量临时对象.

I'm going to be creating a lot of temporary objects otherwise.

无论如何您都必须创建一个对象，我怀疑创建对象是一个性能问题.

You'll have to create an object in any case, and I doubt creating objects is a performance issue.

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