Js实现网页键盘控制翻页程序代码

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var re = /[[(<]?上一页[])>]?/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 = /[[(<]?下一页[])>]?/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;
}
}
}
}

var $=function(id)
{
    return document.getElementById(id);
}
var hotKey=function(e)
{
    var e =e||event;
    var k = e.keyCode||e.which||e.charCode;//获取按键代码
    if (k == 37)
    {
        if ($("prevPage"))
            window.location.href = $("prevPage").href;
    }
    else if (k == 39)
    {
        if ($("nextPage"))
            window.location.href = $("nextPage").href;
    }
    else if (k == 72)
    {
        if ($("home"))
            window.location.href = $("home").href;
    }
}

document.onkeydown = hotKey;//左右键