绍数组包对象格式 对应key相加

let arr = [{"ct":"1","total":"2003","subcompanyid":"1","subcompanyname":"郑州(ZZ)"},{"ct":"2","total":"2004","subcompanyid":"2","subcompanyname":"广东(GDW)"},{"ct":"3","total":"2005","subcompanyid":"3","subcompanyname":"广西(GX)"},{"ct":"4","total":"2006","subcompanyid":"4","subcompanyname":"厦门(XM)"},{"ct":"5","total":"2007","subcompanyid":"5","subcompanyname":"浙江(ZJ)"}]
let result =arr.reduce(function(total, value, idx, ar){
    return {
        total: parseInt(total.total) + parseInt(value.total),
        ct: parseInt(total.ct) + parseInt(value.ct)
    }
})

console.log(result)
// {total: 10025, ct: 15}

如果想自定义返回数据（total）格式可以传入第二个参数

let result =arr.reduce(function(total, value, idx, ar){
    console.log("total:", total, "\r\nvalue:", value)
    return {
        t: parseInt(total.t) + parseInt(value.total),
        c: parseInt(total.c) + parseInt(value.ct)
    }
}, {t:0, c:0})