javascript - 获取特定数组值

Question

var stored =
        [{subject:"farm",name:"John Doe"},
         {subject:"steam",name:"Michael Buck"},
         {subject:"finance",name:"Ron Ruckle"}, //need this
         {subject:"geo",name:"Ben Bond"}];

我需要获取特定的数组值。我知道可以这样做:

     getitem = stored[2]["name"];

但由于我不知道该行，所以只有第一项的值我需要这样的东西:

     getitem = stored["subject:finance"]["name"];

Answer 1

您必须迭代并检查:

function getNameFromSubject(subject) {
    for (var i = 0; i < stored.length; i++) {
        if (stored[i].subject == subject) return stored[i].name;
    }
    return null;
}

var name = getNameFromSubject("finance");