如何从javascript函数返回值

我有以下函数从哪里返回htm值但是我得到一个未定义。我得到一个返回值，因为我已经检查过了。如何从javascript函数返回值

function loadData(uid) { 



      $.ajax({ 
       type: "POST", 
       url: '<%= page.resolveURL("~")%>Haggler.asmx/getLovedProductsSellerStoreByFbId', 
       //url: '<%= Page.ResolveUrl("~")%>Haggler.asmx/GetFacebookFriends', 
       data: '{FacebookId:' + uid + ',pageIndex:' + JSON.stringify(pageIndex) + '}', 
       contentType: "application/json; charset=utf-8", 
       dataType: 'json', 
       async: true, 

       // Page parameter to make sure we load new data 
       success: function (data) { 
        var myObject = eval('(' + data.d + ')'); 

        //alert('getProductDescription' + JSON.stringify(myObject)); 
        var html = ''; 
        pageIndex++; 
        var htmlCategoryList = ''; 
        var i = 0, length = myObject.length; 
        var _productLink = ''; 
        var _productFullLink = ''; 
        if (length > 0) { 
         pageCount = myObject[0].PageCount; 

         if (length > 0) { 

          for (; i < length; i++) { 

           if (myObject[i].ShippingQuantity > 0) { 

            _productLink = myObject[i].SellReqID + '/product/' + myObject[i].CurrentNodeName; 
            _productFullLink = "http://www.xarato.com/" + myObject[i].SellReqID + "/product/" + myObject[i].CurrentNodeName; 
            if (myObject[i].Discount == 0) { 
             /** 
             if (parts[parts.length-1] == 'loves') { 
              html += '<li class="polaroid"><div class="prodoptionbg prodseller"><span>Listed by <a href="/' + _storeLink + '">' + myObject[i].FirstName + ' ' + myObject[i].LastName + '</a></span></div><a href="/' + _productLink + '"><div style="position:relative;"><img alt="' + myObject[i].NodeName + '" src="/' + myObject[i]. 
              html += '<li class="polaroid"><a href="/' + _productLink + '"><div style="position:relative;"><img alt="' + myObject[i].RequestTitle + '" src="/' + myObject[i].Image1 + '"_thumb.jpg" width="200" height="' + myObject[i].ThumbHeight1 + '"><div class="options"><span class="favs" id="span' + myObject[i].SellReqID + '">' + myObject[i].Likes + '</span><span class="fav" onclick="calculateLike(event,' + myObject[i].SellReqID + ')">like it!</span></div></div><div class="prod"><span>' + myObject[i].RequestTitle + '</span></div><div class="prodprice1"><span style="font-weight:700;">Rs. ' + Math.round(parseFloat(myObject[i].MRPrice) + parseFloat(myObject[i].ShippingPrice)) + '</span></div></a></li>'; 

             }else{ **/ 
             //alt="' + myObject[i].RequestTitle + '" 
             html += '<img alt="' + myObject[i].RequestTitle + '" src="/' + myObject[i].Image1 + '_thumb.jpg" width="200" height="' + myObject[i].ThumbHeight1 + '">'; 
             //} 

            } 
            else { 
             /**if (parts[parts.length-1] == 'loves') { 
              var _finalPrice = parseFloat(myObject[i].MRPrice) - (parseFloat(myObject[i].Discount) * parseFloat(myObject[i].MRPrice))/100 

              html += '<li class="polaroid"><div class="prodoptionbg prodseller"><span>Listed by <a href="/' + _storeLink + '">' + myObject[i].FirstName + ' ' + myObject[i].LastName + '</a></span></div><a href="/' + _productLink + '"><div style="position:relative;"><img alt="' + myObject[i].NodeName + '" src="/' + myObject[i].Preview + '_thumb.jpg" width="200" height="' + myObject[i].Height + '"><div class="options"><span class="favs" id="span' + myObject[i].NodeId + '">' + myObject[i].Likes + '</span><span class="fav" onclick="calculateLike(event,' + myObject[i].NodeId + ')">like it!</span></div><div class="kjss"><span>' + myObject[i].Discount + '% Off</span></div></div><div class="prod"><span>' + myObject[i].NodeName + '</span></div><div class="prodprice1"><span style="color:#777777; text-decoration:line-through">Rs. ' + myObject[i].MRPrice + '</span> &nbsp;<span style="font-weight:700;">Rs. ' + Math.round(_finalPrice + parseFloat(myObject[i].ShippingPrice)) + '</span></div></a></li>'; 
             }else{**/ 
             //alt="' + myObject[i].RequestTitle + '" 
             html += '<img alt="' + myObject[i].RequestTitle + '" src="/' + myObject[i].Image1 + '_thumb.jpg" width="200" height="' + myObject[i].ThumbHeight1 + '">'; 
             //} 

            } 
           } 
          } 


          if (clearHtml) { 
           // $('.bxslider').html(''); 

           //htm = '<li>"' + html + '"</li>'; 

          } 

          // var htmli = '<li>"' + html + '"</li>'; 
          // $('.bxslider').append(htmli); 

          htm = '<li>' + html + '</li>'; 
          alert(htm); 
          return htm; 

          clearHtml = false; 

          var options = { 
           autoResize: true, // This will auto-update the layout when the browser window is resized. 
           container: $('#main'), // Optional, used for some extra CSS styling 
           offset: 17, // Optional, the distance between grid items 
           itemWidth: 225 // Optional, the width of a grid item 
          }; 

         } 
         else { 

          return; 
         } 
        } 
        else { 
         return; 
        } 


       }, 

       failure: function (data) { 
        alert('failture'); 
       }, 
       error: function (data) { 
        alert(data.responseText); 

       } 


      }); 


     }

这是我如何获取数据，但我得到一个未定义的值。

HtmlM += loadData(myObject.data[i].uid);

请帮我一把。

来源

2014-01-16 vini

你还可以发布'getLovedProductsSellerStoreByFbId'的源代码吗？你的代码中的 –

我没有看到你在使用它之前的任何地方定义> var htm。 –

您loadData更改为

function loadData(uid, delegate) { 

    ///In ajax instead of return use 
    delegate(htm); 
}

然后调用这样

loadData(myObject.data[i].uid, function(html){ HtmlM += html ;});

Ajax是异步的，所以你不能只返回（是的，你可以做同步，但它不是正确的方式）

来源

2014-01-16 08:14:17

如何从javascript函数返回值

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