在Opa代码中onclick无效

Question

在下面的代码中单击我底部不起作用

database int /counter = 0;
/** action _*/
function action(_){
    /counter++;
    #msg = <div>Thank you, user number {/counter}!</div>
}
/** page */
function page(){
    <h1 id="msg">Hello</h1>
    <a onclick={action}>Click me</a>
}

Server.start(Server.http,
  { title: "Database Demo!", page: page }
)

我按照以下方式编译代码，opa也为我安装了mongodb

$ opa thank.opa --
Http serving on http://mic:8080
DbGen/Mongo Looking for MongoDB in directory '/home/mictadlo/.opa/mongo'
DbGen/Mongo MongoDB does not seem to be installed in '/home/mictadlo/.opa/mongo'
DbGen/Mongo Please wait while Opa downloads MongoDB from 'http://fastdl.mongodb.org/linux/mongodb-linux-x86_64-2.4.8.tgz'...
DbGen/Mongo MongoDB was downloaded (/home/mictadlo/.opa/mongo/mongo.tgz)
DbGen/Mongo Uncompressing of MongoDB archive... (tar -xvzf /home/mictadlo/.opa/mongo/mongo.tgz -C /home/mictadlo/.opa/mongo)
DbGen/Mongo MongoDB seems launched (pid:4494)

为什么点击我链接不起作用？