字符串轉換為整形
System.Int32.Parse("123")
如果你輸入的是System.Int32.Parse("abc")就會報下面的錯誤
FormatException: Input string was not in the correct format
System.Int32.Parse (System.String s) (at /Users/builduser/buildslave/monoAndRuntimeClassLibs/build/mcs/class/corlib/System/Int32.cs:629)
PlayerControl.Update () (at Assets/Script/PlayerControl.cs:22)