如何获取对象内部的数组大小？
[英]How to get array size which is inside an object?
问题描述
I have an array which contains objects like this: 
我有一个包含这样的对象的数组：
dataSet = [{question:"",options:[{subject:"",teacher:""}]}]
How can I get the length of the options array? 如何获得options数组的长度？
1 个解决方案
解决方案1
1 已采纳 2016-05-03 17:41:47
dataSet itself an array. dataSet本身是一个数组。 So get the first index of it and then length of options in it like following. 因此，获取它的第一个索引，然后获取其中的options长度，如下所示。
var dataSet = [{question:"", options:[{subject:"",teacher:""}]}] alert(dataSet[0].options.length);
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