Refactoring JavaScript code samples (compare before and after refactoring) _javascript tips

Today there are a few asp.net with JavaScript tutorial articles. Now look at those JavaScript scripts that are not well written and overly complex. Now extract them and refactor them.
before a：

Copy Code code as follows:

function Selectedall (CB) {
cb.checked = cb.checked? False:true;
var gv = document.getElementById (' <%=gridviewcouplets.clientid%> ');
var rc = gv.rows.length;
for (var i = 1; i < RC; i++) {
var input = gv.rows[i].cells[0].getelementsbytagname ("input");
if (Input[0].type = = "checkbox" && input[0].checked) {
input[0].checked = false;
Gv.rows[i].style.backgroundcolor = "";
}
else {
Input[0].checked = true;
Gv.rows[i].style.backgroundcolor = "#66ff33;";
}
}
}
function Selectedsingle (CB) {
var row = Cb.parentNode.parentNode;
if (cb.checked) {
Row.style.backgroundColor = "#66ff33;";
}
else {
Row.style.backgroundColor = "";
}
}

JavaScript script after refactoring:

Copy Code code as follows:

function Selectedall (CB) {
var gv = document.getElementById (' <%=gridviewcouplets.clientid%> ');
var rc = gv.rows.length;
for (var i = 1; i < RC; i++) {
var input = gv.rows[i].cells[0].getelementsbytagname ("input");
if (Input[0].type = "checkbox")
{
input[0].checked = cb.checked;
Gv.rows[i].style.backgroundcolor = input[0].checked? "#66ff33;": "";
}
}
}
function Selectedsingle (CB) {
var row = Cb.parentNode.parentNode;
Row.style.backgroundColor = cb.checked? "#66ff33;": "";
}

before two：

Copy Code code as follows:

function Check_uncheck_all (CB) {
var cbl = document.getElementById ("<%=CheckBoxListMusicType.ClientID%>");
var input = cbl.getelementsbytagname ("input");
if (cb.checked) {
for (var i = 0; i < input.length; i++) {
Input[i].checked = true;
}
}
else {
for (var i = 0; i < input.length; i++) {
input[i].checked = false;
}
}
}

JavaScript script after refactoring：

Copy Code code as follows:

function Check_uncheck_all (CB) {
var cbl = document.getElementById ("<%=CheckBoxListMusicType.ClientID%>");
var input = cbl.getelementsbytagname ("input");
for (var i = 0; i < input.length; i++) {
input[i].checked = cb.checked;
}
}