按照书本写了以下代码，但貌似因为所用swift版本（我的环境是Xcode7.3）不同导致了一点语法错误，没有想到头绪……let simpleInterestCalculationClosure = { (loadAmmon : Double, var interestRate : Double, years : Int) -> Double in
//警告1:'var' parameters are deprecated and will be remove in swift 3 fix-it Delete "var"
interestRate = interestRate / 100.0
//错误2: Cannot assign to value: 'interestRate' is a 'let' constant
var interest = Double(years) * interestRate * loadAmmon
return loadAmmon + interest
}但是删除了var之后会出现错误2
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