用js实现键盘方向键翻页功能的代码_javascript技巧

今天从网上看到这个功能,不错啊,以后就可以在文章中,增加这个功能了
var re = /[\[\(]?/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 = /[\[\(]?/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;
}
}
}
}