访问对象属性时如何避免eval？

Question

我读了很多书，但我无法弄清楚以下内容：

var eventCity = [
    {date: 'Apr 11 2017', type: 'alpha'},
    {date: 'Apr 26 2017', type: 'beta'}
];

var currentCity = 'eventCity';  // this is generated dynamically

var aDate = eval(currentCity)[0].date;

如何避免使用 eval() 保持相同的结果 ( aDate = 'Apr 11 2017' )？

Answer 1

var options = []

options['eventCity']=[ {date: 'Apr 11 2017', type: 'alpha'}, {date: 'Apr 26 2017', type: 'beta'} ];

Answer 2

为什么不用对象，把动态值作为key呢？

var object = {
        eventCity: [
            { date: 'Apr 11 2017', type: 'alpha' },
            { date: 'Apr 26 2017', type: 'beta' }
        ]
    },
    currentCity = 'eventCity',  // this is generated dynamically
    aDate = object[currentCity][0].date;

访问对象属性时如何避免eval？

How to avoid eval when accessing object properties?

javascript

eval

properties