添加Microsoft.JScript、Microsoft.JScript.Vsa二个程序集的引用，示例代码如下:

using Microsoft.JScript;
using Microsoft.JScript.Vsa;
using System;
namespace JsCSharp
{
    class Program
    {
        static VsaEngine Engine = VsaEngine.CreateEngine();
        static void Main(string[] args)
        {
            var i = (int)EvalJScript("1+2;");
            Console.WriteLine(i);//3
            var d = (DateObject)EvalJScript("var d = new Date(2013,9-1,2,20,30,15)");
            Console.WriteLine(d);//Mon Sep 2 20:30:15 UTC+8 2013
            var j = EvalJScript("function add(x,y){return x+y;};add(5,10);");
            Console.WriteLine(j);//15
            var obj = EvalJScript("var obj = {};obj.name='jimmy';obj.sex='Male';");
            Console.WriteLine(obj);//Male 注：只返回最后一条执行的语句结果
            Console.Read();
        }
        static object EvalJScript(string JScript)
        {
            object Result = null;
            try
            {
                Result = Microsoft.JScript.Eval.JScriptEvaluate(JScript, Engine);
            }
            catch (Exception ex)
            {
                return ex.Message;
            }
            return Result;
        }
    }
}

来源：http://www.manongjc.com/detail/50-nznzuprmqdqxdvh.html