js监听键盘方向键事件

• <SCRIPT language=javascript>
      document.onkeydown = chang_page;
      function chang_page() {
          if (event.keyCode == 37 || event.keyCode == 33) location = 'http://www.maitianquan.com';
          if (event.keyCode == 39 || event.keyCode == 34) location = 'http://www.lanrentuku.com'
      }
    </SCRIPT>

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