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August 29, 2015 14:00
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a usage of `~`
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| res.type = function(type){ | |
| return this.set('Content-Type', ~type.indexOf('/') | |
| ? type | |
| : mime.lookup(type)); | |
| }; | |
| # 判断Cotent-Type中是否有/，比如application/json | |
| # 如果有就去查询mime | |
| # 在js中， null, undefined , '' 以及0都是false | |
| # ~-1 === 0 | |
| # ~按位取反 | |
| # 这样就避免了使用 ~type.indexOf('/') === -1 |
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