javascript - 通过Json对象查询

Question

这是我的 JSON:

[{"Id":1,"Order":1,"IsDone":true,"Text":"abc","Date":"6/14/2014"},
 {"Id":2,"Order":2,"IsDone":false,"Text":"cde","Date":"6/15/2014"},
 {"Id":3,"Order":3,"IsDone":false,"Text":"fgh","Date":"6/16/2014"}]

获取 IsDone == true 计数的最有效方法是什么？

Answer 1

您可以使用普通的 javascript 迭代:

var a=[{"Id":1,"Order":1,"IsDone":true,"Text":"abc","Date":"6/14/2014"},{"Id":2,"Order":2,"IsDone":false,"Text":"cde","Date":"6/15/2014"},{"Id":3,"Order":3,"IsDone":false,"Text":"fgh","Date":"6/16/2014"}]

var ct=0;
a.forEach(function(entry) {
    if(entry.IsDone)ct++;
});
alert(ct);