声明结构化javascript变量中的自引用

Suppose I declare a structured Javascript variable like this:

假设我声明了一个结构化的Javascript变量,如下所示:

var mydata = {'list':[
{'fname':'george','lname':'washington'}
,{'fname':'oscar','lname':'wilde'}
,{'fname':'james','lname':'polk'}
]
,'summary':this.list[1]['lname']
}

Question: How can I ensure that

问题:我如何确保这一点

this.list[1]['lname']

equals 'wilde' and that my "this" is actually referring to what I intend?

等于'wilde'而我的“这个”实际上指的是我的意图?

2 个解决方案

#1

You could also make this work in a function.

你也可以在一个函数中使这个工作。

var mydata = {'list':[
{'fname':'george','lname':'washington'}
,{'fname':'oscar','lname':'wilde'}
,{'fname':'james','lname':'polk'}
]
,'summary':function(){return this.list[1]['lname']}
}

alert(mydata.summary());

#2

this won't work as written, but you could do:

这不会像书面那样有效,但你可以这样做:

var mydata = {'list':[
{'fname':'george','lname':'washington'}
,{'fname':'oscar','lname':'wilde'}
,{'fname':'james','lname':'polk'}
]
}   

mydata.summary = mydata.list[1]['lname'];

#1