如果null使用陣列中的另一個圖像

Question

我有一個ImageUrl和ThumbUrl的對象數組。如果ThumbUrl爲空，我希望它用ImageUrl替換。我有這個，但它不工作：推入陣時

$.each(results.Photos, function(i, pic){ 

    pic.ImageThumbUrl == null ? pic.ImageUrl;  

topicsPhoto.push({ 
     picUrl: pic.ImageUrl, 
     picThumb: pic.ImageThumbUrl, 
     picDescription: pic.Description 
    }); 

}); 

Answer 1

pic.ImageThumbUrl = pic.ImageThumbUrl || pic.ImageUrl;  

或者只是：

topicsPhoto.push({ 
     picUrl: pic.ImageUrl, 
     picThumb: pic.ImageThumbUrl || pic.ImageUrl, 
     picDescription: pic.Description 
    }); 

Answer 2

pic.ImageThumbUrl = (pic.ImageThumbUrl == null) ? pic.ImageUrl : pic.ImageThumbUrl; 

Answer 3

var photos = [ 
    { ImageUrl: "imageurl1.png", ImageThumbUrl: "thumburl1.png" }, 
    { ImageUrl: "imageurl2.png", ImageThumbUrl: "" }, 
    { ImageUrl: "imageurl3.png", ImageThumbUrl: null }, 
    { ImageUrl: "imageurl4.png" } 
]; 

$.each(photos, function(i, photo) { 
    photo.ImageThumbUrl = photo.ImageThumbUrl || photo.ImageUrl; 
}); 

$.each(photos, function(i, photo) { 
    $("#out").append("<br/>imageurl = " + photo.ImageUrl + ", imagethumburl = " + photo.ImageThumbUrl); 
}); 

呈現...

imageurl = imageurl1.png, imagethumburl = thumburl1.png 
imageurl = imageurl2.png, imagethumburl = imageurl2.png 
imageurl = imageurl3.png, imagethumburl = imageurl3.png 
imageurl = imageurl4.png, imagethumburl = imageurl4.png 

您可以在這裏看到它的動作：http://jsbin.com/ekemey/edit#javascript,html,live