下面我有三个JSON语句，我已经变成了一个JavaScript对象。我想打印出每个语句的actor，动词和对象。我在使用object.definition.name时遇到问题，因为有时它会出现在其他语言中。由于这个和我现在编码的方式，它给了我＆＃34; undefined＆＃34;对于第二个陈述，因为第二个陈述是fr-FR而不是en-US。如何修改循环的对象部分，这样无论用什么语言它都会给我一个对象？
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Get Statements 1 demo</title>
<script src="xapiwrapper.min.js"></script>
</head>
<body>
<p id='demo'></p>
<script>
var obj1 =
{
"statements": [{
"verb": {
"id": "http://adlnet.gov/expapi/verbs/initialized",
"display": {
"en-US": "initialized"
}
},
"version": "1.0.0",
"timestamp": "2017-05-25T13:01:49.439248+00:00",
"object": {
"definition": {
"extensions": {
"http://example.com": 12
},
"name": {
"en-US": "Change management app"
}
},
"id": "https://www.avimegiddo.com/wp-admin/admin-ajax.php?action=h5p_embed&id=12",
"objectType": "Activity"
},
"actor": {
"mbox": "mailto:john.doe@abc.com",
"name": "John Doe",
"objectType": "Agent"
},
"stored": "2017-05-25T13:01:49.439248+00:00",
"authority": {
"mbox": "mailto:tom.creighton.ctr@adlnet.gov",
"name": "tom",
"objectType": "Agent"
},
"id": "2b03bcd0-11bd-4b43-a256-7e7c8cb259fc"
},
{
"verb": {
"id": "http://adlnet.gov/expapi/verbs/attempted",
"display": {
"en-US": "attempted"
}
},
"version": "1.0.0",
"timestamp": "2017-05-25T12:54:52.184309+00:00",
"object": {
"definition": {
"extensions": {
"http://h5p.org/x-api/h5p-local-content-id": 12
},
"name": {
"fr-FR": "le livre"
}
},
"id": "https://www.avimegiddo.com/wp-admin/admin-ajax.php?action=h5p_embed&id=12",
"objectType": "Activity"
},
"actor": {
"mbox": "mailto:sally.smith@abc.com",
"name": "Sally Smith",
"objectType": "Agent"
},
"stored": "2017-05-25T12:54:52.184309+00:00",
"authority": {
"mbox": "mailto:megiddo@gmail.com",
"name": "avimegiddo",
"objectType": "Agent"
},
"context": {
"contextActivities": {
"category": [{
"id": "http://h5p.org/libraries/H5P.DragText-1.5",
"objectType": "Activity"
}],
"grouping": [{
"definition": {
"moreInfo": "https://www.avimegiddo.com/business-emails/",
"type": "http://activitystrea.ms/schema/1.0/page",
"name": {
"en": "How to write business emails: be formal and polite. ESL / EFL Practice Quizzes."
}
},
"id": "https://www.avimegiddo.com/business-emails/"
}]
}
},
"id": "83105145-a27c-4bec-bbb0-c1c9f9775930"
},
{
"verb": {
"id": "http://adlnet.gov/expapi/verbs/attempted",
"display": {
"en-US": "attempted"
}
},
"version": "1.0.0",
"timestamp": "2017-05-25T13:51:45.976631+00:00",
"object": {
"definition": {
"extensions": {
"http://h5p.org/x-api/h5p-local-content-id": 5,
"http://h5p.org/x-api/h5p-subContentId": "bb5c8621-1bcf-4cc7-b1b0-8af2950bffcd"
},
"name": {
"en-US": "Drag the words into the correct boxes\n"
}
},
"id": "https://www.avimegiddo.com/wp-admin/admin-ajax.php?action=h5p_embed&id=5?subContentId=bb5c8621-1bcf-4cc7-b1b0-8af2950bffcd",
"objectType": "Activity"
},
"actor": {
"mbox": "mailto:terry.phillips@abc.com",
"name": "Terry Phillips",
"objectType": "Agent"
},
"stored": "2017-05-25T13:51:45.976631+00:00",
"authority": {
"mbox": "mailto:megiddo@gmail.com",
"name": "avimegiddo",
"objectType": "Agent"
},
"context": {
"extensions": {
"http://id.tincanapi.com/extension/ending-point": 1
},
"contextActivities": {
"category": [{
"id": "http://h5p.org/libraries/H5P.DragText-1.5",
"objectType": "Activity"
}],
"parent": [{
"id": "https://www.avimegiddo.com/wp-admin/admin-ajax.php?action=h5p_embed&id=5",
"objectType": "Activity"
}],
"grouping": [{
"definition": {
"moreInfo": "https://www.avimegiddo.com/2017/04/21/business-emails-short-quizzes/",
"type": "http://activitystrea.ms/schema/1.0/page",
"name": {
"en": "Projects ~ Avi Megiddo"
}
},
"id": "https://www.avimegiddo.com/2017/04/21/business-emails-short-quizzes/"
}]
}
},
"id": "7b0582d3-c22d-4818-937e-cc0e5ffbbf18"
}
]
}
var actorVerbObject = "";
for (i=0; i<3; i++){
actorVerbObject += obj1.statements[i].actor.name + ", " + obj1.statements[i].verb.display['en-US'] + ", " + obj1.statements[i].object.definition.name['en-US'] + "<br />";
}
document.getElementById('demo').innerHTML = actorVerbObject;
</script>
</body>
</html>
答案 0 :(得分：0)
使用Object.keys请参阅此fiddle
var actorVerbObject = "";
for (i = 0; i < 3; i++) {
var displayLangs = Object.keys(obj1.statements[i].verb.display);
var definitionLangs = Object.keys(obj1.statements[i].object.definition.name);
actorVerbObject += obj1.statements[i].actor.name + ", " + obj1.statements[i].verb.display[displayLangs[0]] + ", " + obj1.statements[i].object.definition.name[definitionLangs[0]] + "<br />";
}