谁能向我解释这种行为?
>> "#$"
SyntaxError: (irb):3: unterminated string meets end of file
from /Users/milan/.rvm/rubies/ruby-1.9.2-head/bin/irb:16:in `<main>
>> "#@"
SyntaxError: (irb):4: syntax error, unexpected $undefined
(irb):4: unterminated string meets end of file
from /Users/milan/.rvm/rubies/ruby-1.9.2-head/bin/irb:16:in `<main>
>> "#$$"
"10994"
我是否误解了1.9.2的新特征? 没收。
如你可能知道,你可以在双面报价中使用<代码>#{表达},将expression<>/code>值插入该职位指示。 鲜为人知的是,如果表达只是一个全球性的或偶然的变量,那么你就能够离开图书馆。 页: 1 在双重引用的插图中,将插入全球变量代码<>$foo和#@foo等变量的数值。
因此,你头两个例子有误,因为它认为你希望分别获得“<> >$> 或<>>>>>>的变数(后者不是一个变数的名称——虽然第一个是——这就是为什么你要获得两个错误的信息,而仅是第一个错误信息),留下了空白。 第三个例子只是给你<代码>$的价值。
如果你不希望做到这一点,你就能够躲避“<>#,背后(或者简单地使用单一报价,而不用双重引用,如果你不需要任何双重的特例行为)。
这种行为并不具体针对1.9条,它始终如一。
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