转换此数组:
a = ["item 1", "item 2", "item 3", "item 4"]
...to a Hash:
{ "item 1" => "item 2", "item 3" => "item 4" }
也就是说,偶数索引处的元素是键,奇数索引处的元素是值。
https://stackoverflow.com/questions/4028329
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