003.交互式sass

在命令行中输入 sass -i,然后输入想要测试的Sass查看输出结果:

$ sass -i
>> "Hello, Sassy World!"
"Hello, Sassy World!"
>> 1px + 1px + 1px
3px
>> #777 + #777
#eeeeee
>> #777 + #888
white

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