js+cookies实现悬浮购物车的方法

// JavaScript Document//计算单个小计 function EveryCount() {  var index=window.event.srcElement.parentElement.parentElement.rowIndex;  var a=document.getElementById("test").rows(index).cells(1).innerText;  var b=document.getElementById("Num"+index).value;  var c=parseFloat(a)*parseFloat(b);  document.getElementById("test").rows(index).cells(3).innerText=c;  TotalCount();  updateOrderCookie();//修改cookies中保存的数量 }//计算总计function TotalCount(){  var rowscount=document.getElementById("test").rows.length;  var sum=0;  for(var i=1;i<=(parseInt(rowscount)-1);i++)  {    var littecount=document.getElementById("test").rows(i).cells(3).innerText;    sum=parseFloat(sum)+parseFloat(littecount);  }  document.getElementById("total").innerText=sum;}//<--Start--将订单数据写入divfunction WriteOrderInDiv(){ var gwc="<table id='test' style='border:0px;' ><tr><td width='40%'>商品名称</td><td>单价(￥)</td><td>数量</td><td>小计</td></tr>"; var OrderString=unescape(ReadOrderForm('24_OrderForm'));//获取cookies中的购物车信息 //document.write(OrderString); var strs= new Array(); //定义一个数组，用于存储购物车里的每一条信息 var OneOrder=""; //strs=OrderString.split("%7C");//用|分割出购物车中的每个产品 strs=OrderString.split("|");//用|分割出购物车中的每个产品 for (i=1;i<strs.length ;i++ )   { gwc+="<tr>"; //OneOrder=strs[i].split("%26"); OneOrder=strs[i].split("&"); for (a=1;a<OneOrder.length ;a++ )   {  if(a!=3)  {  gwc+="<td>";  gwc+=OneOrder[a];  gwc+="</td>";  }  else  {  gwc+="<td id='dd'>";  gwc+="<input title='填写想购买的数量,请使用合法数字字符' style='width:10px;' id='Num"+i+"' type='text' onkeyup='EveryCount();'value='"+OneOrder[a]+"'>";  gwc+="</td>";  }  //document.getElementById("gwc").innerHTML+=OneOrder[a]+"<br/>";//每个产品的每个属性分割后字符输出 } gwc+="<td>";  gwc+=OneOrder[2]*OneOrder[3];  gwc+="</td>";  gwc+="</tr>";    //document.getElementById("gwc").innerHTML+=strs[i]+"<br/>";  //每个产品分割后的字符输出  } gwc+="</table>"; document.getElementById("Cart").innerHTML=gwc; TotalCount();}//<--End--将订单数据写入div//--Start--展开/收缩购物车function show(id){if (document.getElementById(id).style.display=="") {document.getElementById(id).style.display='none';}else{document.getElementById(id).style.display='';}}//<--End--展开/收缩购物车//<--Start--从cookie中读出订单数据的函数function ReadOrderForm(name){  var cookieString=document.cookie;  if (cookieString=="")  {    return false;  }  else  {    var firstChar,lastChar;    firstChar=cookieString.indexOf(name);    if(firstChar!=-1)    {      firstChar+=name.length+1;      lastChar = cookieString.indexOf(';', firstChar);      if(lastChar == -1) lastChar=cookieString.length;      return cookieString.substring(firstChar,lastChar);    }    else    {      return false;    }  }  }//-->End//<--Start--添加商品至购物车的函数,参数(商品编号,商品名称，商品数量，商品单价)function SetOrderForm(item_no,item_name,item_amount,item_price){  var cookieString=document.cookie;  if (cookieString.length>=4000)  {    alert("您的订单已满/n请结束此次订单操作后添加新订单！");  }  else if(item_amount<1||item_amount.indexOf('.')!=-1)  {    alert("数量输入错误！");  }  else  {    var mer_list=ReadOrderForm('24_OrderForm');    var Then = new Date();    Then.setTime(Then.getTime()+30*60*1000);    var item_detail="|"+item_no+"&"+item_name+"&"+item_price+"&"+item_amount;    if(mer_list==false)    {      document.cookie="24_OrderForm="+escape(item_detail)+";expires=" + Then.toGMTString();      alert("“"+item_name+"”/n"+"已经加入您的订单！");    }    else    {      if (mer_list.indexOf(escape(item_no))!=-1)      {        alert('此商品您已添加/n请进入订单修改数量！')      }      else      {        document.cookie="24_OrderForm="+mer_list+escape(item_detail)+";expires=" + Then.toGMTString();        alert("“"+item_name+"”/n"+"已经加入您的订单！");      }    }  }}//-->End//<--Start--修改数量后，更新cookie的函数function updateOrderCookie(){ var rowscount=document.getElementById("test").rows.length;  var item_detail="";  for(var i=1;i<=(parseInt(rowscount)-1);i++)  {    item_detail+="|"+document.getElementById("test").rows(i).cells(0).innerText+"&"+document.getElementById("test").rows(i).cells(0).innerText+"&"+document.getElementById("test").rows(i).cells(1).innerText+"&"+document.getElementById("Num"+i).value;   // document.write(document.getElementById("test").rows(i).cells(1).innerText);  } var Then = new Date(); Then.setTime(Then.getTime()+30*60*1000); document.cookie="24_OrderForm="+escape(item_detail)+";expires=" + Then.toGMTString();}//<--End--订单更新//<--清空购物车function clearOrder() {var Then = new Date();document.cookie="24_OrderForm='';expires=" + Then.toGMTString();}//<--End

<script src="js/gwc.js" type="text/javascript"></script><div width="300px"> <div id="Cart" style="line-height: 24px; font-size: 12px; background-color: #f0f0f0; border-top: 1px #ffffff solid；display:none; "> </div> <div id="Info">      总计：<strong><span id="total" style="color: #FF0000; font-size: 36px">0</span></strong>元  <input type="button" value="清空" onclick="clearOrder();WriteOrderInDiv();" />  <input type="button" value="展开/收缩" onclick="show('Cart')" /> </div> <input type="button" value="加入商品1" onclick="SetOrderForm('NO1','商品1','1','3.5');WriteOrderInDiv();" /> <input type="button" value="加入商品2" onclick="SetOrderForm('NO2','商品2','1','5.5');WriteOrderInDiv();" /> <input type="button" value="加入商品3" onclick="SetOrderForm('NO3','商品3','1','10.5');WriteOrderInDiv();" /> </div>  <script>  window.WriteOrderInDiv();  </script>