javascript实现的使用方向键控制光标在table单元格中切换_javascript技巧

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var tdnum = 0;
var trid = "td";
// 键盘事件
document.onkeydown = function(event){
// 兼容 Mozilla Firefox
if (null == event) {
event = window.event;
}
if (event.keyCode == 13) {
p13key();
}
else if (event.keyCode = 37) {
keytd(event.keyCode);
}
}
// 按下回车键
function p13key(){
var tdid = trid + tdnum;
var tdtitle = document.getElementById(tdid).getAttribute("title");
var pos = tdtitle.indexOf("|");
var seatname = tdtitle.substring(0, pos);
var seatid = tdtitle.substring(pos + 1, tdtitle.length);
window.alert(seatname + "," + seatid);
}
// 变换颜色
function setcolor(oldtd, newtd){
document.getElementById(oldtd).style.backgroundColor="#dcdcdc";
document.getElementById(newtd).style.backgroundColor="#6699FF";
}
// 实现切换功能主要代码
function keytd(key){
// 左
if (key == 37) {
--tdnum;
if (null == document.getElementById(trid + tdnum)) {
tdnum++;
return;
}
setcolor(trid + (tdnum + 1), trid + tdnum);
}
// 右
else if (key == 39) {
++tdnum;
if (null == document.getElementById(trid + tdnum)) {
tdnum--;
return;
}
setcolor(trid + (tdnum - 1), trid + tdnum);
}
// 上
else if (key == 38) {
tdnum = tdnum - 5;
if (null == document.getElementById(trid + tdnum)) {
tdnum = tdnum + 5;
return;
}
setcolor(trid + (tdnum + 5), trid + tdnum);
}
// 下
else if (key == 40) {
tdnum = tdnum + 5;
if (null == document.getElementById(trid + tdnum)) {
tdnum = tdnum - 5;
return;
}
setcolor(trid + (tdnum - 5), trid + tdnum);
}
}