一个定义了Car变量，另一个定义了指向Car的指针。
var car Car // defines variable car is a Carcar2 := new(Car) // defines variable car2 is a *Car and assigns a Car to back it
car := new(Car)可以这样实现
var car Car：
var x Carcar := &x
一个定义了Car变量，另一个定义了指向Car的指针。
var car Car // defines variable car is a Carcar2 := new(Car) // defines variable car2 is a *Car and assigns a Car to back it
car := new(Car)可以这样实现
var car Car：
var x Carcar := &x
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