Coffeescript 切换时

Coffescript switch when

我的咖啡脚本如下:

level = switch
      when 0 <= value <= 1 then 0
      when 1 < value <= 2 then 1
      when 2 < value <= 3 then 2
      when 3 < value <= 4 then 3
      when 4 < value <= 5 then 4
      else 6

为什么我得到:

Uncaught Error: ExecJS::ProgramError: [stdin]:15:4: error: unexpected when when 1 < value <= 2 then 1

这很好用:

 when value <= cool then 0
      when value >= warm then 4
      else 
        bucketSize = (warm - cool) / 3 # Total # of colours in middle
        Math.ceil (value - cool) / bucketSize

这也有效:

 level = switch
      when value <= 1 then 0
      when value <= 4 then 4
      else 5

直到我添加 当值 <=2 然后 1

一切都是为了缩进。

level = switch
      when 0 <= value < 1 then 0
      when 1 <= value < 2 then 1
      when 2 <= value < 3 then 2
      when 3 <= value < 4 then 3
      when 4 <= value <= 5 then 4
      else 5

我把代码放在这里:http://www.coffeelint.org/

然后检查了缩进。