小编Cho*_*der的帖子

由此：

var x = [ 
    {category: 'Title', price: 100 }, 
    {category: 'Title', price: 200 },
    {category: 'Title3', price: 300 },
    {category: 'Title3', price: 400 },
    {category: 'Title5', price: 500 },
];

对此：

var x = [
    {category: 'Title', price: 300},
    {category: 'Title3', price: 700},
    {category: 'Title5', price: 500},
];            

逻辑与 SQL 查询相同：

SELECT category, sum (price) FROM x GROUP BY category;