如何访问动态属性：objectName。{variable} [英] How to access a dynamic property: objectName.{variable}

问题描述

我需要访问

objectName.myID 

但myID部分是动态生成的..

but the "myID" part is dynamically generated..

我该怎么做？

我试过

this['objectName.'+ variable]

我讨厌使用eval ......

i'd hate to use eval...

ps
顺便发生在函数（本地范围）中..

ps this happens in a function (local scope) by the way..

推荐答案

你可以访问对象属性有两种方式：

o.propertyname
//or
o.["propertyname"]

使用括号表示法时，必须将属性名称放在引号中，否则它将被解释为变量名称（在您的情况下，它正是您想要的）。因此，在您将属性名称存储为字符串的情况下，可行的方法是：

When using the bracket notation you have to put the propertyname in quotes or else it will be interpreted as a variable name (which in your case is exactly what you want). So in your case where you have stored the name of the property as a string, the way to go would be:

var variable = "propertyname";
o[variable];
/* /\ variable is replace with it's string representation "propertyname" */

您甚至可以通过这种方式调用方法：

You can even call methods this way:

var o = {};
var functionname = 'toString';
o[functionname]();

你可以混合两种符号，你的例子如下：

You can mix both notations, your example would look like:

var obj = 'objectName';
var prop = 'myID';
this[obj][prop]
// or this is possible too:
this.objectName[prop]

这篇关于如何访问动态属性：objectName。{variable}的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！