在一个网页嵌入Javascript代码时不生效，不知道怎么解决
<head>
<meta charset="utf-8">
<title>无标题文档</title>
</head>
<style type="text/css">
table{width: 500px; height: 200px;}
td {text-align: center; vertical-align: middle;}
.myBtn{margin: 20px; width: 120px; height: 45px; border: 1px ridge #44FFEE}
</style>
<script type="text/javascript">
var result = "" ;
var price = new Array(138.00,299.00,388.00,420.00,89.00,72.00,15.00,99.00);
var product = new Array("极限竞速：地平线4","the Hunter:Call of Wild","潜渊症","破晓传奇","近月少女的礼仪","八方旅人","一生推不如一生恋","Halo:Infinite");
var isSelected = new Array(0,0,0,0,0,0,0,0);
function clearAll(){
isSelected = [0,0,0,0,0,0,0,0];
myForm.sp0.checked = false;
myForm.sp1.checked = false;
myForm.sp2.checked = false;
myForm.sp3.checked = false;
myForm.sp4.checked = false;
myForm.sp5.checked = false;
myForm.sp6.checked = false;
myForm.sp7.checked = false;
myForm.sp8.checked = false;
}
function checkOut(){
var total = 0;
var count = 0;
for(var i = 0; i< isSelected.length;i++){
count += isSelected[i];
}
for(var i = 0; i < price.length; i++){
total = total+price[i] * isSelected[i]
}
alert("您所选择的游戏"+ count + "件,总价格为" + total+"\n"+"请完成支付");
}
function shoppingCart(){
var selectList = "";
for(var j = 0; j < product.length; j++){
if(isSelected[j]){
selectList += (j + 1) + "-" + product[j] + ",价值=" + price[j] + "\n";
}
}
var info = (selectList == "") ? "您的购物车为空，请添加商品！"： selectList;
alert(info);
}
function checkSelect(number){
var temp;
switch(number){
case 0:
temp = myForm.sp0.checked;break;
case 1:
temp = myForm.sp1.checked;break;
case 2:
temp = myForm.sp2.checked;break;
case 3:
temp = myForm.sp3.checked;break;
case 4:
temp = myForm.sp4.checked;break;
default:
temp = myForm.sp5.checked:break;
}
isSelected[number] = (temp) ? 1:0;
}
</script>
<body>
<form name="myForm" method="post" action="">
<table align="center" border="1">
<caption>模拟游戏节促销大选</caption>
<tr>
<td><img src="图片素材/header (1).jpg"/><br/>
<h4 name="h41">极限竞速：地平线4</h4>
<input type="checkbox" name="sp0" value="138" onClick="checkSelect(0);">￥138<br /></td>
<td><img src="图片素材/header_schinese.jpg"/><br/>
<h4 name="h41">thr Hunter:Call of Wild</h4>
<input type="checkbox" name="sp0" value="299" onClick="checkSelect(0);">￥299<br /></td>
<td><img src="图片素材/header_schinese (1).jpg"/><br/>
<h4 name="h41">潜渊症</h4>
<input type="checkbox" name="sp0" value="388" onClick="checkSelect(0);">￥388<br /></td>
</tr>
<tr>
<td><img src="图片素材/header.jpg"/><br/>
<h4 name="h41">破晓传奇</h4>
<input type="checkbox" name="sp0" value="89" onClick="checkSelect(0);">￥89<br /></td>
<td><img src="图片素材/header_schinese (2).jpg"/><br/>
<h4 name="h41">近月少女的礼仪</h4>
<input type="checkbox" name="sp0" value="72" onClick="checkSelect(0);">￥72<br /></td>
<td><img src="图片素材/header (2).jpg"/><br/>
<h4 name="h41">八方旅人</h4>
<input type="checkbox" name="sp0" value="15" onClick="checkSelect(0);">￥15<br /></td>
<tr>
<td><img src="图片素材/header_schinese (3).jpg"/><br/>
<h4 name="h41">一生推不如一生恋</h4>
<input type="checkbox" name="sp0" value="99" onClick="checkSelect(0);">￥99<br /></td>
<td><img src="图片素材/header (4).jpg"/><br/>
<h4 name="h41">Halo:Infinite</h4>
<input type="checkbox" name="sp0" value="420" onClick="checkSelect(0);">￥420<br /></td>
</tr>
</tr>
<tr>
<td colspan="3">
<input class="myBtn" type="button" value="查看购物车" onclick="shoppingCart();">
<input class="myBtn" type="button" value="收银台结算" onclick="checkOut();">
<input class="myBtn" type="button" value="清空购物车" onclick="clearAll();">
</td>
</tr>
</table>
</form>
</body>
我预览的时候完全没有效果点击按钮没有反应，求帮助
