checkbox习题 _Web前端

checkbox练习
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>无标题文档</title>

<script type="text/javascript">

function getSum()
{
	var items = document.getElementsByName("item");
	var sum = 0;
	for(var x = 0; x < items.length; x++)
	{
		if(items[x].checked)
		{
			sum += parseInt(items[x].value);
		}
	}
	var str = sum + "元";
	document.getElementById("sumid").innerHTML = str.fontcolor('red');
}

function checkAll(node)
{
	var items = document.getElementsByName("item");
	for(var x = 0; x < items.length; x++)
	{
		items[x].checked = node.checked;
	}
}
</script>
</head>

<body>

<div>商品列表</div>

<input type="checkbox" name="all" onclick="checkAll(this)" />全选<br />
<input type="checkbox" name="item" value="3000" />笔记本电脑3000元<br />
<input type="checkbox" name="item" value="3000" />笔记本电脑3000元<br />
<input type="checkbox" name="item" value="3000" />笔记本电脑3000元<br />
<input type="checkbox" name="item" value="3000" />笔记本电脑3000元<br />
<input type="checkbox" name="item" value="3000" />笔记本电脑3000元<br />
<input type="checkbox" name="item" value="3000" />笔记本电脑3000元<br />
<input type="checkbox" name="all" onclick="checkAll(this)" />全选<br />
<input type="button" value="总结额：" onclick="getSum()" /><span id="sumid"></span>

</body>
</html>
运行结果：