mojo_hub let a : Int = 1 let b : Int = 2 # let a, b = 1, 2 # error declaration must have either a type or an initializer # let a : Int, b : Int = 1, 2 error unknown tokens at the end of a declaration print("a = ", a, " b = ", b) 这尚不支持,但我们绝对需要!