如何在点符号中使用变量,如方括号表示法

问题描述:

我一直在Javascript中使用方括号表示来创建和调用关联数组。

I have been using square bracket notation in Javascript to create and call associative arrays.

在这个例子中,我理解方括号表示法允许你使用变量调用数组中的某个对象。

In this example, I understand that square bracket notation allows you to use a variable to call a certain object in the array.

你会用点符号做这样的事情吗?

How would you do something like this in dot notation?

var item = {};
    item['1'] = 'pen';

var x = 1;

console.log(item[x]);  // console will show 'pen'


你可以' t使用点表示法中的变量(使用 eval 除外, 使用点表示法,属性名称基本上是常量。

You can't use variables in dot notation (short of using eval, which you don't want to do). With dot notation the property name is essentially a constant.

myObj.propName
// is equivalent to
myObj["propName"]