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：
