什么是查询在JavaScript数组得到的只是从中我想要的物品的最佳方式？ [英] What's the best way to query an array in javascript to get just the items from it I want?

问题描述

我有一个这样的数组（刚刚超过3000对象，而不是这里的3）：

I have an array like this (with just over 3000 objects instead of the 3 here):

items = [{name:'charlie', age:'16'}, {name:'ben', age:'18'}, {name:'steve', age:'18'}]

什么是返回与人谁是18只是对象的数组的最佳方式？所以，我想：

What's the best way to return an array with just the objects of people who are 18? So I want:

items = [{name:'ben', age:'18'}, {name:'steve', age:'18'}]

我能想到的最好的是这（使用jQuery）：

The best I can think of is this (using jQuery):

newArray = []
$.each(items, function(index, item) {
    if(item.age=='18') {
        newArray.push(item)
    }
})

考虑到有300万的对象，还以为我会做这种对比高达50倍的一气呵成，这是一个很大的循环。有没有更好的办法？

Considering that there's 3000 thousand objects, and also that I'll be doing that comparison up to fifty times in one go, that's a lot of looping. Is there a better way?

推荐答案

您可以使用纯JavaScript

You can use pure javascript

var wanted = items.filter( function(item){return (item.age==18);} );

如果你的浏览器不支持1.6版本的JavaScript，你可以找到在过滤器方法的实现<一个href=\"https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Array/filter\">https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Array/filter

更新

Speed​​wise有一个<击>巨大变^{（在测试中出现错误的）}从正常回路（的根据浏览器的区别的）..看一看这个小测试，我在 http://jsperf.com/array做-filter-VS环/ 3

Speedwise there is a huge varying ^{(had an error in the test)} difference from a normal loop (depending on browser).. Have a look at this little test i made at http://jsperf.com/array-filter-vs-loop/3

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