//解析javascript语法，创建ScriptParser
ScriptParser parser = ScriptParser.Parse("var i = 0; return i + inc;");

//创建执行上下文：ScriptContext
ScriptContext context = new ScriptContext();

//添加变量，以及方法映射
context.AddValue("inc", 100);

//执行
parser.Execute(context);

//获取执行结果
object result = context.Result.ToValue(context);

class ScriptResult
{
    private string source;
    private StringBuilder builder;

    public ScriptResult(string source)
    {
        this.source = source;
        this.builder = new StringBuilder();
    }

    [ScriptMapping("output")]
    public void Output(int index, int length)
    {
        builder.Append(source.Substring(index, length));
    }

    [ScriptMapping("write")]
    public void Write(IScriptObject value, ScriptContext context)
    {
        builder.Append(value.ToValueString(context));
    }

    public override string ToString()
    {
        return builder.ToString();
    }
}

//将包含<@XXX></@XXX>的标签，转成可以执行的javascript语法
TagParser reader = new TagParser();
string script = reader.Parse(text, "output", "write", true);

//解析javascript语法
ScriptParser parser = ScriptParser.Parse(script);

ScriptContext context = new ScriptContext();
//将output和write的方法映射添加到执行的上下文中
ScriptResult result = new ScriptResult(text);
context.AddMappings(result);

//执行javascript脚本
parser.Execute(context);

//读取结果
string content = result.ToString();