Recently the project has written some JS, the level waits for enhances _javascript skill

Copy Code code as follows:

function Resumeerror () {
return true;
}
Window.onerror = Resumeerror;

function Showdd (obj) {
var DDS = document.getElementById (obj). getElementsByTagName ("DD");
var len = dds.length;
if (Dds[0].style.display = = "None") {
The action is to expand the menu to determine if there is a cookie in the
1, have, delete
2, no, do not perform operation
Changeshowmenu (obj);
for (var i = 0; i < len;i++) {
Dds[i].style.display = "";
}
}else{
This action is a hidden menu, and you need to determine whether the item is in the cookie:
1, have, do not perform operation
2, none, then add it at the end
Changehidemenu (obj);
for (var i = 0; i < len;i++) {
Dds[i].style.display = "None";
}
}
}

function Changeshowmenu (obj) {
var temp = GetCookie ("OpenID");
if (Temp.indexof (obj)!= "-1") {
temp = temp.replace (obj + ",", "")
Addcookie ("OpenID", temp,24);
}
}

function Changehidemenu (obj) {
var temp = GetCookie ("OpenID");
if (temp.indexof (obj) = = "-1") {
Addcookie ("OpenID", temp+obj+ ",", 24);
}
}


function GetCookie (sname) {//Get cookie
var acookie = Document.cookie.split (";");
For (Var j=0 j < Acookie.length; J + +) {
var acrumb = acookie[j].split ("=");
if (sname = = Acrumb[0])
return acrumb[1];
}
return null;
}

function Addcookie (objname,objvalue,objhours) {//Add cookies
var str = objname + "=" + ObjValue;
if (objhours > 0) {//0 does not set the expiration time, the cookie automatically disappears when the browser shuts down
var date = new Date ();
var ms = objhours*3600*1000;
Date.settime (Date.gettime () + ms);
str + = "; Expires= "+ date.togmtstring ();
}
Document.cookie = str;
}

Based on a comma-separated string, initialize the menu which needs to be hidden
function Initmenu (obj) {
var arrmenu = Obj.split (",");
for (var i = 0; i < arrmenu.length;i++) {
var DDS = document.getElementById (Arrmenu[i]). getElementsByTagName ("DD");
for (var j = 0;j < dds.length;j++) {
Dds[j].style.display = "None";
}
}
}

function $ (obj) {
return document.getElementById (obj);
}

function Delit () {
var cbxbool = 0;
for (var i = 0;i < cbxarray.length;i++) {
var obj = $ (cbxarray[i]);
if (obj.checked = = True) {
Cbxbool = 1;
Break
}
}

if (Cbxbool = = 1) {
var result = confirm (operation cannot be recovered, determine the current operation?) ");
if (result) {
return true;
}
}else{
Alert ("You have not selected");
return false;
}
return false;

}
Window.onload = function () {
var Lendl = document.getElementById ("Globalleft"). getElementsByTagName ("DL"). Length;
if (GetCookie ("OpenID") = = null) {
Addcookie ("OpenID", "Dl_c,dl_d,dl_e,dl_f,dl_g,dl_h,dl_i,dl_j,", 24);
}
Initmenu (GetCookie ("OpenID"));



var otable = document.getElementById ("table");
var trs = Otable.getelementsbytagname ("tr");
for (var i = 0;i < trs.length;i++) {
Trs[i].onmouseover = function () {
This.style.backgroundColor = "#F7F7F7";
}
Trs[i].onmouseout = function () {
This.style.backgroundColor = "#FFFFFF";
}
}
}