重构Javascript代码示例(重构前后对比)

今天有做了几个asp.net结合Javascript的教程文章。现回顾头来看看那些Javascript脚本，有写得不太理想，过于复杂。现抽取出来，重构它们。
之前一：

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 = ""; 
} 
}

经过重构之后的Javascript脚本:

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;":""; 
}

之前二：

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; 
} 
} 
}

重构之后的Javascript脚本：

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; 
} 
}