javascript DOM编程实例(智播客学习)

<xmp>
<select id="province" onchange="selCity()">
<option >--选择省份--</option>
<option >北京</option>
<option >天津</option>
<option >湖北</option>
<option >山东</option>
<option >河北</option>
</select>
<select id="city">
<option>--选择城市--</option>
</select>
</xmp>

<script type="text/javascript">
function selCity()
{
var arr= [["--选择城市--"],["海淀区","朝阳区","东城区","西城区","宣武区"],
["和平区","河北区","河东区","河西区","南开区"],
["武汉","宜昌","孝感","襄樊","荆州"],
["济南","青岛","烟台","威海","日照"],
["石家庄","保定","张家口","廊坊","邯郸"]];
var selpNode = document.getElementById("province");
var selcNode = document.getElementById("city");
var citys = arr[selpNode.selectedIndex];
selcNode.options.length = 0;
for(var x=0; x<citys.length; x++)
{
var optNode = document.createElement("option");
optNode.innerText = citys[x];
selcNode.appendChild(optNode);
}
}
</script>

<script>
var color ="";
function getStyle()
{
var tableNode =document.getElementsByTagName("table")[0];
var arr = tableNode.rows;
for(var x = 0;x<arr.length;x++)
{
if(x%2)
arr[x].className = "one";
else
arr[x].className = "two";
var tdNode0 = arr[x].cells[0];
tdNode0.align = "center";
arr[x].onmouseover = function()
{
color = this.className;//将原有的值记录，一遍鼠标走后能回到原来的颜色
this.className = "checked";
}
arr[x].onmouseout = function()
{
this.className = color;
}
}
}
//我们需要全选实现同样的功能，所以我们通过传值来区分是那个节点
function allCheck(index)
{
var allNode = document.getElementsByName("all")[index];
var checkNodes = document.getElementsByName("mail");
for(var x=0;x<checkNodes.length;x++)
{
checkNodes[x].checked = allNode.checked;
}
}
function checkBut(num)
{
var mailNodes = document.getElementsByName("mail");
for(var x=0; x<mailNodes.length; x++)
{
if(num>1)
mailNodes[x].checked = !(mailNodes[x].checked);//将自己状态反向赋给自己实现反选功能
else
mailNodes[x].checked = num;
}
}
function del()
{
var b = window.confirm("确定要删除所选邮件吗？");
if(!b)
return ;
var mailNodes = document.getElementsByName("mail");
var arr = new Array();
var pos = 0;
for(var x=0; x<mailNodes.length; x++)
{
if(mailNodes[x].checked)
{
var trNode = mailNodes[x].parentNode.parentNode;
arr[pos++] = trNode;
}
}
for(var x=0; x<arr.length; x++)
{
arr[x].parentNode.removeChild(arr[x]);
}
getStyle();
}
window.onload = getStyle;
</script>