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19 lines
460 B
19 lines
460 B
module.exports = isFunction
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var toString = Object.prototype.toString
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function isFunction (fn) {
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if (!fn) {
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return false
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}
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var string = toString.call(fn)
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return string === '[object Function]' ||
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(typeof fn === 'function' && string !== '[object RegExp]') ||
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(typeof window !== 'undefined' &&
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// IE8 and below
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(fn === window.setTimeout ||
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fn === window.alert ||
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fn === window.confirm ||
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fn === window.prompt))
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};
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