我想从youtube api获取json响应中的一些元素： 我在剧本中得到了这个回复：
{
"version": "1.0",
"encoding": "UTF-8",
"feed": {
"xmlns": "http://www.w3.org/2005/Atom",
"xmlns$media": "http://search.yahoo.com/mrss/",
"xmlns$openSearch": "http://a9.com/-/spec/opensearchrss/1.0/",
"xmlns$gd": "http://schemas.google.com/g/2005",
"xmlns$yt": "http://gdata.youtube.com/schemas/2007",
"id": {
"$t": "http://gdata.youtube.com/feeds/api/videos"
},
"updated": {
"$t": "2013-01-13T15:48:18.863Z"
},
"category": [
{
"scheme": "http://schemas.google.com/g/2005#kind",
"term": "http://gdata.youtube.com/schemas/2007#video"
}
],
"title": {
"$t": "Videos matching: humor",
"type": "text"
},
"logo": {
"$t": "http://www.youtube.com/img/pic_youtubelogo_123x63.gif"
},
"link": [
{
"rel": "alternate",
"type": "text/html",
"href": "http://www.youtube.com"
},
{
"rel": "http://schemas.google.com/g/2005#feed",
"type": "application/atom+xml",
"href": "http://gdata.youtube.com/feeds/api/videos"
},
{
"rel": "http://schemas.google.com/g/2005#batch",
"type": "application/atom+xml",
"href": "http://gdata.youtube.com/feeds/api/videos/batch"
},
{
"rel": "self",
"type": "application/atom+xml",
"href": "http://gdata.youtube.com/feeds/api/videos?alt=json&q=humor&start-index=1&max-results=1&lr=es&orderby=published"
},
{
"rel": "next",
"type": "application/atom+xml",
"href": "http://gdata.youtube.com/feeds/api/videos?alt=json&q=humor&start-index=2&max-results=1&lr=es&orderby=published"
}
],
"author": [
{
"name": {
"$t": "YouTube"
},
"uri": {
"$t": "http://www.youtube.com/"
}
}
],
"generator": {
"$t": "YouTube data API",
"version": "2.1",
"uri": "http://gdata.youtube.com"
},
"openSearch$totalResults": {
"$t": 10595
},
"openSearch$startIndex": {
"$t": 1
},
"openSearch$itemsPerPage": {
"$t": 1
},
"entry": [
{
"id": {
"$t": "http://gdata.youtube.com/feeds/api/videos/HAUdFeouzgM"
},
"published": {
"$t": "2013-01-13T15:43:26.000Z"
},
"updated": {
"$t": "2013-01-13T15:43:26.000Z"
},
"category": [
{
"scheme": "http://schemas.google.com/g/2005#kind",
"term": "http://gdata.youtube.com/schemas/2007#video"
},
{
"scheme": "http://gdata.youtube.com/schemas/2007/categories.cat",
"term": "Film",
"label": "Cine y animación"
}
],
"title": {
"$t": "Chica Troll en dibujo: TiparracoSA (IrukoArt)",
"type": "text"
},
"content": {
"$t": "Canal del artista creador: www.youtube.com Si quieres ver camaras ocultas dale aqui: www.youtube.com Si quieres ver a la chica troll VS pervertidos aqui: www.youtube.com Canal principal --- (Bromas con camara oculta y humor) www.youtube.com Sigueme en Twitter: twitter.com Sigueme en Facebook: www.facebook.com",
"type": "text"
},
"link": [
{
"rel": "alternate",
"type": "text/html",
"href": "http://www.youtube.com/watch?v=HAUdFeouzgM&feature=youtube_gdata"
},
{
"rel": "http://gdata.youtube.com/schemas/2007#video.responses",
"type": "application/atom+xml",
"href": "http://gdata.youtube.com/feeds/api/videos/HAUdFeouzgM/responses"
},
{
"rel": "http://gdata.youtube.com/schemas/2007#video.related",
"type": "application/atom+xml",
"href": "http://gdata.youtube.com/feeds/api/videos/HAUdFeouzgM/related"
},
{
"rel": "http://gdata.youtube.com/schemas/2007#mobile",
"type": "text/html",
"href": "http://m.youtube.com/details?v=HAUdFeouzgM"
},
{
"rel": "self",
"type": "application/atom+xml",
"href": "http://gdata.youtube.com/feeds/api/videos/HAUdFeouzgM"
}
],
"author": [
{
"name": {
"$t": "TiparracoTV"
},
"uri": {
"$t": "http://gdata.youtube.com/feeds/api/users/TiparracoTV"
}
}
],
"gd$comments": {
"gd$feedLink": {
"rel": "http://gdata.youtube.com/schemas/2007#comments",
"href": "http://gdata.youtube.com/feeds/api/videos/HAUdFeouzgM/comments",
"countHint": 0
}
},
"media$group": {
"media$category": [
{
"$t": "Film",
"label": "Cine y animación",
"scheme": "http://gdata.youtube.com/schemas/2007/categories.cat"
}
],
"media$content": [
{
"url": "http://www.youtube.com/v/HAUdFeouzgM?version=3&f=videos&app=youtube_gdata",
"type": "application/x-shockwave-flash",
"medium": "video",
"isDefault": "true",
"expression": "full",
"duration": 324,
"yt$format": 5
},
{
"url": "rtsp://v1.cache2.c.youtube.com/CiILENy73wIaGQkDzi7qFR0FHBMYDSANFEgGUgZ2aWRlb3MM/0/0/0/video.3gp",
"type": "video/3gpp",
"medium": "video",
"expression": "full",
"duration": 324,
"yt$format": 1
},
{
"url": "rtsp://v1.cache2.c.youtube.com/CiILENy73wIaGQkDzi7qFR0FHBMYESARFEgGUgZ2aWRlb3MM/0/0/0/video.3gp",
"type": "video/3gpp",
"medium": "video",
"expression": "full",
"duration": 324,
"yt$format": 6
}
],
"media$description": {
"$t": "Canal del artista creador: www.youtube.com Si quieres ver camaras ocultas dale aqui: www.youtube.com Si quieres ver a la chica troll VS pervertidos aqui: www.youtube.com Canal principal --- (Bromas con camara oculta y humor) www.youtube.com Sigueme en Twitter: twitter.com Sigueme en Facebook: www.facebook.com",
"type": "plain"
},
"media$keywords": {
},
"media$player": [
{
"url": "http://www.youtube.com/watch?v=HAUdFeouzgM&feature=youtube_gdata_player"
}
],
"media$thumbnail": [
{
"url": "http://i.ytimg.com/vi/HAUdFeouzgM/0.jpg",
"height": 360,
"width": 480,
"time": "00:02:42"
},
{
"url": "http://i.ytimg.com/vi/HAUdFeouzgM/1.jpg",
"height": 90,
"width": 120,
"time": "00:01:21"
},
{
"url": "http://i.ytimg.com/vi/HAUdFeouzgM/2.jpg",
"height": 90,
"width": 120,
"time": "00:02:42"
},
{
"url": "http://i.ytimg.com/vi/HAUdFeouzgM/3.jpg",
"height": 90,
"width": 120,
"time": "00:04:03"
}
],
"media$title": {
"$t": "Chica Troll en dibujo: TiparracoSA (IrukoArt)",
"type": "plain"
},
"yt$duration": {
"seconds": "324"
}
},
"yt$statistics": {
"favoriteCount": "0",
"viewCount": "1"
}
}
]
}
}
我想访问一些元素，如标题，标签和链接，以便在我的脚本中使用。我eval json并且我尝试访问元素，但是在数组内部和另一个json对象我认为并且无法使脚本工作：
var datos=data.responseText;
var respuesta = eval("(" + data.responseText + ")");
alert(respuesta.entry.title);
此代码不起作用，我如何访问元素？
答案 0 :(得分：1)
请尝试使用alert(respuesta.entry[0].title);。 entry是一个数组。
编辑同样正如我们在评论entry中所提到的那样，在json中更深层次。正确的表达式实际上是：alert(respuesta.feed.entry[0].title);。我建议你使用Online JSON Beautifier来使你的json变得更加容易理解。