JS方向键翻页

var re = /<a href=[\"\']?([-=\w\.\/\?]+)[\"\']?>[\[\(<]?上一页[\]\)>]?<\/a>/igm;
if (window.document.body.innerHTML.search(re) >= 0) {
  var PREVIOUS_PAGE = RegExp.$1;
}
如果搜下到"上一页",则定义var PREVIOUS_PAGE = RegExp.$1;
var re = /<a href=[\"\']?([-=\w\.\/\?]+)[\"\']?>[\[\(<]?下一页[\]\)>]?<\/a>/igm;
if (window.document.body.innerHTML.search(re) >= 0) {
  var NEXT_PAGE = RegExp.$1;
}
如果搜下到"下一页",则定义var NEXT_PAGE = RegExp.$1;
if (typeof PREVIOUS_PAGE == "string" || typeof NEXT_PAGE == "string") {
  document.onkeydown = function() {
    switch (event.srcElement.tagName) {
        case "INPUT":
        case "TEXTAREA":
        case "SELECT":
          break;
        default:
          if (event.keyCode == 37 /* Arrow Left*/ && typeof PREVIOUS_PAGE == "string") {
            window.location.href = PREVIOUS_PAGE;
          }
          else if (event.keyCode == 39 /* Arrow Right */ && typeof NEXT_PAGE == "string") {
            window.location.href = NEXT_PAGE;
          }
    }
  }
}
详细出处参考：http://www.jb51.net/article/10205.htm