求用javascript编写的简易购物车小程序如图所示：

JavaScript010

求用javascript编写的简易购物车小程序如图所示：,第1张

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

<head>

<title>MyHtml2.html</title>

<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">

<meta http-equiv="description" content="this is my page">

<meta http-equiv="content-type" content="text/htmlcharset=UTF-8">

<script>

/*

*@author Caoshun

*@计算 合计费用

*/

function countMethod(){

var num=document.getElementById("num").value

var unitPrice=document.getElementById("unitPrice").value

var freight=document.getElementById("freight").value

document.getElementById("result").value=parseFloat((num*unitPrice))+parseFloat(freight)

}

</script>

</head>

<body>

<table border="1" cellpadding="1" cellspacing="1" background="#red" style="text-align: center">

<tr><td colspan="5" align="center">简易购物车</td></tr>

<tr>

<td>商品名称</td>

<td>数量(件)</td>

<td>单价(美元)</td>

<td>运费(美元)</td>

<td><input type="button" value="合计" onclick="countMethod()"></td>

</tr>

<tr>

<td>跑跑道具</td>

<td><input type="text" size="6" id="num"></td>

<td><input type="text" size="6" id="unitPrice"></td>

<td><input type="text" size="6" id="freight"></td>

<td><input type="text" size="6" id="result"></td>

</tr>

</table>

</body>

</html>

<script language='javascript'>

function checkSum()

{

var sum = 0

for(var i=0i<document.form1.elements["writer"].lengthi++)

{

if(document.form1.elements["writer"][i].checked)

{

sum = sum +parseInt(document.form1.elements["writer"][i].value)

}

}

totalprice.innerText = sum +" 元"

}

</script>

<form method=post name=form1>

<input type="checkbox" name=writer value="34" onclick="checkSum()">韩国耳饰tm56（34元）<br>

<input type="checkbox" name=writer value="46" onclick="checkSum()">纯银吊坠tc34（46元）<br>

<input type="checkbox" name=writer value="30" onclick="checkSum()">黄莺手镯ta345（30元）<br>

<input type="checkbox" name=writer value="40" onclick="checkSum()">翡翠玉镯1346（40元）<br>

<input type="checkbox" name=writer value="50" onclick="checkSum()">天涯耳饰1233（50元）<br>

<br>

总价为：<span id="totalprice">0 元</span>

</form>