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函数强大问题 #1

@scscms

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@scscms
/**
 18、capitalize:字符串首位大写
 */
function capitalize(str){
	return str.charAt(0).toUpperCase() + str.slice(1)
}
capitalize('aA')
capitalize(null)
capitalize(undefined)
capitalize(NaN)

....需要优化强大

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