解析JSON字符串的最佳方法是什么?
我使用 $。getJSON
生成了一个JavaScript对象(称之为'jItems'
)。在页面上,我有一个jItems中的项目适合的类别列表。我的愿望是单击一个类别并触发一个功能,只显示该类别中的项目。使用 getJson
或jquery的每个()
或 find()
从 jItems
中提取正确的项目?
I've generated a JavaScript object (call it 'jItems'
) using $.getJSON
. On the page, I've got a list of categories that the items in jItems fit into. My desire is to click a category and trigger a function to display only the items in that category. Would it be better to use getJson
or jquery's each()
or find()
to pull the right items from jItems
?
这一切都取决于你的数据如何,但这可能对你有所帮助:
It all depends on how your data looks like but this might help you I think:
var jsonCats = [
{"id": "category1", "items": [{"iid":"item1"}, {"iid":"item2"}, {"iid":"item3"}]},
{"id": "category2", "items": [{"iid":"item4"}, {"iid":"item5"}, {"iid":"item6"}]},
{"id": "category3", "items": [{"iid":"item7"}, {"iid":"item8"}, {"iid":"item9"}]},
{"id": "category4", "items": [{"iid":"item0"}]}
];
$.each(jsonCats, function(key, value) {
var category = $("<li>" + this.id + "</li>");
var items = this.items;
$("#categories").append(category);
category.click(function() {
$("#items").empty();
for (var j in items) {
var item = $("<option>" + items[j].iid + "</option>");
$("#items").append(item);
}
});
});
要查看示例: http://jsfiddle.net/tive/U63EY/
编辑:
现在我再次阅读你的问题...实际上,使用for循环更好,因为这样更快。 $ .each()无论如何都是for循环的包装器。 (因此示例:D)
Now I read your question again ... it's actually better to use for loops since this is faster. The $.each() is a wrapper of the for loop anyway. (Hence the example :D)