2a09d1a4
 liuqimichale
添加宜春 天水 宣化
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module.exports = isFunction
var toString = Object.prototype.toString
function isFunction (fn) {
var string = toString.call(fn)
return string === '[object Function]' ||
(typeof fn === 'function' && string !== '[object RegExp]') ||
(typeof window !== 'undefined' &&
// IE8 and below
(fn === window.setTimeout ||
fn === window.alert ||
fn === window.confirm ||
fn === window.prompt))
};
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