const computedBehavior = require('miniprogram-computed')
    behaviors: [computedBehavior],
    computed: {
        newHistoryList(data) {
            var list = data.historyList
            list.forEach(i => {
                i.topThree = i.product.slice(0, 3)
                i.lastThree = i.product.slice(3, 6)
            })
            console.log(list);
            return list
        }

},

这个list输出是有topThree，lastThree的。但是return到AppData里面没有
z这是什么问题