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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