apicloud如何控制一个指向未知外部url的frame进行刷新

demo.html

<style>
*{background: #fff}
</style>
<br>
<br>
<br>
<div onclick="reload()"> reload() </div>
<script>
  apiready=function () {
      alert('read');
      api.openFrame({
          name: 'page2',
          url: 'http://www.baidu.com',
          rect: {
              x: 0,
              y: 150,
              w: 320,
              h: 480
          },
          pageParam: {
              name: 'test'
          },
          bounces: true,
          bgColor: 'rgba(0,0,0,0)',
          vScrollBarEnabled: true,
          hScrollBarEnabled: true
      });

  }
  function reload(){
    var js = 'alert(\'reload later！\');window.location.reload()';
    api.execScript({
      frameName:"page2",
      script: js
    });
  }
</script>