$.ajax({
        url: url,// 请求的地址
        data:{id:id,pieceId:pieceId,pieceDesc:pieceDesc,actualStock:actualStock,leadtime:leadtime,safeday:safeday,supplyGap:supplyGap,reorganizeDay:reorganizeDay},// 请求参数
        type:"get",// 请求方式
        dataType:"json",// 预期服务器返回的数据类型
        success: function(resp) {
            hideLoadingWnd();
        
            // 成功时的回调函数
            if(resp.success=="true"){
                alert("Piece modified.");
                goPage('goPage.html?path=/pages/piece/list/index.jsp');
            }else{
                alert("Modify Piece failed because "+resp.msg);
            }
        },
        timeout: 50000,// 超时时间，超时后会调用error后的函数
        error: function(xhr, textStatus, errorThrown) {
            hideLoadingWnd();
            
            // 404 请求地址无效
            if(XMLHttpRequest.status=='404'){
                alert("404:请求地址"+url+"无效.");                
                return;
            }
            
            var msg="xhr.readyState="+xhr.readyState+"\n";
            msg+="xhr.status="+xhr.status+"\n";
            msg+="textStatus="+textStatus+"\n";
            msg+="errorThrown="+errorThrown+"\n";
            alert(msg);
        }
    
    });