JavaScript json 多个键

Question

我有一个 JSON var

{
"total":4,
"page":1,
"pagesize":30,
"type":"associated_user",
"items":[
{
"user_id":2727,
"site_name":"Physics",
"user_creation_date":1300894372,
"association_id":"2fbcabe5-cd42-4f5b-821e-2f1475e42ade"
},
{
"user_id":3864,
"site_name":"TeX - LaTeX",
"user_creation_date":1298808016,
"association_id":"2fbcabe5-cd42-4f5b-821e-2f1475e42ade"
},
{
"user_id":5983,
"site_name":"Stack Apps",
"user_creation_date":1301323608,
"association_id":"2fbcabe5-cd42-4f5b-821e-2f1475e42ade"
},
{
"user_id":6260,
"site_name":"English Language and Usage",
"user_creation_date":1300449905,
"association_id":"2fbcabe5-cd42-4f5b-821e-2f1475e42ade"
}
]
}

如您所见，items 块中有四个 site_name 键。我只能使用 items[0].site_name 访问第一个，但如何逐一访问其他三个？

Answer 1

问候
如果我理解对了，那么你需要像这样循环对象数组

var obj ={
"total":4,
"page":1,
"pagesize":30,
"type":"associated_user",
"items":[
{
"user_id":2727,
"site_name":"Physics",
"user_creation_date":1300894372,
"association_id":"2fbcabe5-cd42-4f5b-821e-2f1475e42ade"
},
{
"user_id":3864,
"site_name":"TeX - LaTeX",
"user_creation_date":1298808016,
"association_id":"2fbcabe5-cd42-4f5b-821e-2f1475e42ade"
},
{
"user_id":5983,
"site_name":"Stack Apps",
"user_creation_date":1301323608,
"association_id":"2fbcabe5-cd42-4f5b-821e-2f1475e42ade"
},
{
"user_id":6260,
"site_name":"English Language and Usage",
"user_creation_date":1300449905,
"association_id":"2fbcabe5-cd42-4f5b-821e-2f1475e42ade"
}
]
};

var objItems = obj.items;
for(var i=0;i<objItems .length;i++)
{
alert(obj.items[i].site_name);
}

Answer 2

要获取所有站点名称，

您需要运行 while 循环 来动态执行此操作

var i=0
while(i<items.length){

var site_name=items[i].site_name;
}

Answer 3

您可以使用 jquery 轻松做到这一点：

$( jsonvar ).each(function() {
tempvar = this.site_name;
});

然后，这将循环遍历“tempvar”中存储所需段的项目