ajax简易教程2（转载）
<div class="cnt">Servlet请求处理<div style="padding-right: 5px; padding-left: 4px; font-size: 13px; padding-bottom: 4px; width: 98%; padding-top: 4px; background-color: #eeeeee; border: #cccccc 1px solid;">http://wdtclv.cnblogs.com/Images/OutliningIndicators/None.gif*http://wdtclv.cnblogs.com/Images/OutliningIndicators/None.gif* 通过产品编码，在购物车中添加一个条目
http://wdtclv.cnblogs.com/Images/OutliningIndicators/None.gif* itemCode – 需要添加条目的产品编码
http://wdtclv.cnblogs.com/Images/OutliningIndicators/None.gif*/
http://wdtclv.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gifhttp://wdtclv.cnblogs.com/Images/OutliningIndicators/ContractedBlock.giffunction addToCart(itemCode) http://www.cnblogs.com/Images/dot.gif{
http://wdtclv.cnblogs.com/Images/OutliningIndicators/InBlock.gif // 获取一个XMLHttpRequest实例
http://wdtclv.cnblogs.com/Images/OutliningIndicators/InBlock.gif var req = newXMLHttpRequest();
http://wdtclv.cnblogs.com/Images/OutliningIndicators/InBlock.gif // 设置用来从请求对象接收回调通知的句柄函数
http://wdtclv.cnblogs.com/Images/OutliningIndicators/InBlock.gif var handlerFunction = getReadyStateHandler(req, updateCart);
http://wdtclv.cnblogs.com/Images/OutliningIndicators/InBlock.gif req.onreadystatechange = handlerFunction;
http://wdtclv.cnblogs.com/Images/OutliningIndicators/InBlock.gif // 打开一个联接到购物车servlet的HTTP POST联接
http://wdtclv.cnblogs.com/Images/OutliningIndicators/InBlock.gif // 第三个参数表示请求是异步的
http://wdtclv.cnblogs.com/Images/OutliningIndicators/InBlock.gif req.open("POST", "cart.do", true);
http://wdtclv.cnblogs.com/Images/OutliningIndicators/InBlock.gif // 指示请求体包含form数据
http://wdtclv.cnblogs.com/Images/OutliningIndicators/InBlock.gif req.setRequestHeader("Content-Type",
http://wdtclv.cnblogs.com/Images/OutliningIndicators/InBlock.gif "application/x-www-form-urlencoded");
http://wdtclv.cnblogs.com/Images/OutliningIndicators/InBlock.gif // 发送标志需要添加到购物车中条目的form-encoded数据
http://wdtclv.cnblogs.com/Images/OutliningIndicators/InBlock.gif req.send("action=add&item="+itemCode);
http://wdtclv.cnblogs.com/Images/OutliningIndicators/ExpandedBlockEnd.gif}
http://wdtclv.cnblogs.com/Images/OutliningIndicators/None.gif
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