微软自家的.Net下的JavaScript引擎——ClearScript

之前我介绍过一个开源的.Net下的Javascript引擎Javascript .NET，今天发现微软自己也开源了一个JavaScript引擎——ClearScript（当然，也支持VB Script）。

由于是微软发布的，基本上没有什么好挑剔的地方，稳定而强大，不过不支持WinRT。下面这个则是官方示例，就不做更多介绍了，感兴趣的朋友可以去CodePlex看下。

 1 using System;

 2 using Microsoft.ClearScript;

 3 using Microsoft.ClearScript.V8;

 4 

 5 // create a script engine

 6 using (var engine = new V8ScriptEngine())

 7 {

 8     // expose a host type

 9     engine.AddHostType("Console", typeof(Console));

10     engine.Execute("Console.WriteLine('{0} is an interesting number.', Math.PI)");

11 

12     // expose a host object

13     engine.AddHostObject("random", new Random());

14     engine.Execute("Console.WriteLine(random.NextDouble())");

15 

16     // expose entire assemblies

17     engine.AddHostObject("lib", new HostTypeCollection("mscorlib", "System.Core"));

18     engine.Execute("Console.WriteLine(lib.System.DateTime.Now)");

19 

20     // create a host object from script

21     engine.Execute(@"

22         birthday = new lib.System.DateTime(2007, 5, 22);

23         Console.WriteLine(birthday.ToLongDateString());

24     ");

25 

26     // use a generic class from script

27     engine.Execute(@"

28         Dictionary = lib.System.Collections.Generic.Dictionary;

29         dict = new Dictionary(lib.System.String, lib.System.Int32);

30         dict.Add('foo', 123);

31     ");

32 

33     // call a host method with an output parameter

34     engine.AddHostObject("host", new HostFunctions());

35     engine.Execute(@"

36         intVar = host.newVar(lib.System.Int32);

37         found = dict.TryGetValue('foo', intVar.out);

38         Console.WriteLine('{0} {1}', found, intVar);

39     ");

40 

41     // create and populate a host array

42     engine.Execute(@"

43         numbers = host.newArr(lib.System.Int32, 20);

44         for (var i = 0; i < numbers.Length; i++) { numbers[i] = i; }

45         Console.WriteLine(lib.System.String.Join(', ', numbers));

46     ");

47 

48     // create a script delegate

49     engine.Execute(@"

50         Filter = lib.System.Func(lib.System.Int32, lib.System.Boolean);

51         oddFilter = new Filter(function(value) {

52             return (value & 1) ? true : false;

53         });

54     ");

55 

56     // use LINQ from script

57     engine.Execute(@"

58         oddNumbers = numbers.Where(oddFilter);

59         Console.WriteLine(lib.System.String.Join(', ', oddNumbers));

60     ");

61 

62     // use a dynamic host object

63     engine.Execute(@"

64         expando = new lib.System.Dynamic.ExpandoObject();

65         expando.foo = 123;

66         expando.bar = 'qux';

67         delete expando.foo;

68     ");

69 

70     // call a script function

71     engine.Execute("function print(x) { Console.WriteLine(x); }");

72     engine.Script.print(DateTime.Now.DayOfWeek);

73 

74     // examine a script object

75     engine.Execute("person = { name: 'Fred', age: 5 }");

76     Console.WriteLine(engine.Script.person.name);

77 }

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