我有一段 Javascript/Coffeescript 似乎执行不正常.
I have a section of Javascript/Coffeescript that seems to be executing out of order.
console.log list
console.log list[card_number]
if list[card_number]
console.log "MATCHES"
new_card = list[card_number]
else
console.log "NO MATCHES"
new_card = create_new_card(card_number)
create_new_card: (card_number) ->
new_card =
card_number: card_number
list[new_card.card_number] = new_card
return new_card
每次运行时,第一个 console.log
都会显示包含 new_card 的卡片列表,即使卡片尚未创建.然后它总是点击 else
,不管它运行多少次.
Every time I run this, the first console.log
shows a list of cards that includes the new_card, Even if the card hasn't been created yet. Then it ALWAYS hits the else
, no matter how many times it is run.
如果我在这段代码运行后尝试在 Javascript 控制台中运行 list[<card_number>]
,我会收到正确的对象,但每次代码自行运行时,都会出现相同的事件发生.
If I attempt to run list[<card_number>]
in the Javascript console after this code runs, I receive the proper object, but each time the code runs on it's own, the same event happens.
在 google chrome 中,如果你想用它们在记录时的状态记录对象,你需要记录一个克隆对象或者只是将它字符串化.
In google chrome, if you want to log objects with the state they had at the time of logging, you need to log a clone object or just stringify it.
var a = [];
console.log(a);
a[0] = 3;
将记录 [3]
因为它记录了一个活动对象,而这将记录 []
:
Will log [3]
because it logs a live object, while this will log []
:
var a = [];
console.log(JSON.parse(JSON.stringify(a)));
a[0] = 3;
它也是一个活动对象日志记录,但它是在 a
没有任何项目的时间点克隆的一次性克隆.
It is also a live object logging but it is a throwaway clone that was cloned at the point in time when a
didn't have any items.
这与@CallumRogers 指出的代码中可能存在的逻辑错误无关.
This is not related to the possible logical errors in your code that @CallumRogers pointed out.
这篇关于Javascript代码执行顺序异常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跟版网!