我正在尝试弄清楚如何使用
UnderscoreJS中的
_.countBy()方法汇总以下数据.我有以下数据：
var data =
[
{"id":"338b79f07dfe8b3877b3aa41a5bb8a58","value":{"country":"United States"}},{"id":"338b79f07dfe8b3877b3aa41a5bb983e","value":{"country":"Norway"}},{"id":"338b79f07dfe8b3877b3aa41a5ddfefe","value":{"country":"Hungary"}},{"id":"338b79f07dfe8b3877b3aa41a5fe29d7",{"id":"b6ed02fb38d6506d7371c419751e8a14","value":{"country":"Germany"}},{"id":"b6ed02fb38d6506d7371c419753e20b6",{"id":"b6ed02fb38d6506d7371c419755f34ad",{"id":"b6ed02fb38d6506d7371c419755f3e17",{"id":"338b79f07dfe8b3877b3aa41a506082f","value":{"country":"United Kingdom"}},{"id":"9366afb036bf8b63c9f45379bbe29509","value":{"country":"United Kingdom"}}
]
我想这样总结一下：
{
United_States: 3,Norway: 1,Hungary: 2,Germany: 2,United_Kingdom: 2
}
解决方法
试试这个：
var data =
[
{"id":"338b79f07dfe8b3877b3aa41a5bb8a58","value":{"country":"United Kingdom"}}
];
var countData = _.countBy(data,function(obj){
return obj.value.country.replace(" ","_");
});
console.log(countData);
JSFiddle：http://jsfiddle.net/hyDv7/1/
