jquery - 如何限制jquery中json数据的each循环？

Question

有没有一种好的方法可以使用 jquery every 循环仅循环 json 对象的前 3 项？

我正在考虑类似 .slice(start,end) 的内容功能。

var data = [ 
 {"Id": 10004, "PageName": "club"}, 
 {"Id": 10040, "PageName": "qaz"}, 
 {"Id": 10059, "PageName": "ee"}, 
 {"Id": 10089, "PageName": "dd"}, 
 {"Id": 10095, "PageName": "hh"}
];

$.each(data, function(i, item) {
    alert(item.PageName);
    // somehow break at item 3
});​

Answer 1

var data = [ 
 {"Id": 10004, "PageName": "club"}, 
 {"Id": 10040, "PageName": "qaz"}, 
 {"Id": 10059, "PageName": "ee"}, 
 {"Id": 10089, "PageName": "dd"}, 
 {"Id": 10095, "PageName": "hh"}
];

$.each(data, function(i, item) {
    alert(item.PageName);
    return i<2;
});​

当你返回 false 时，每个都会停止。

来自文档:

We can break the $.each() loop at a particular iteration by making the callback function return false. Returning non-false is the same as a continue statement in a for loop; it will skip immediately to the next iteration.