您可以定义一个变量 sum 并迭代地将 equity.price 添加到其中，如下所示:

You can define a variable sum and iteratively add equity.price to it as follows:

    cashDividends() {
        let sum = 0
        this.equities.forEach(function(equity)) {
            sum+=equity.price
        }

        return sum
    }