重构Javascript代码示例(重构前后对比)_javascript技巧

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('');
var rc = gv.rows.length;
for (var i = 1; 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('');
var rc = gv.rows.length;
for (var i = 1; 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("");
var input = cbl.getElementsByTagName("input");
if (cb.checked) {
for (var i = 0; i input[i].checked = true;
}
}
else {
for (var i = 0; i input[i].checked = false;
}
}
}

重构之后的Javascript脚本：

function Check_Uncheck_All(cb) {
var cbl = document.getElementById("");
var input = cbl.getElementsByTagName("input");
for (var i = 0; i input[i].checked = cb.checked;
}
}