求教大神js如何修改数组对象中字符串的值

Question

我设置这样一个数组

let aaa = [
{
    type:'硬币',
    useSum:'12000',
    remainSum:'0',
    basicSum:'0',
    useDate:'2019-05-14'},
{
    type:'纸币',
    useSum:'120000',
    remainSum:'10000',
    basicSum:'/',
    useDate:'2019-05-14'
}
]

传过来的金额为分，我想将它修改为元

 let bbb = [
 {
    type:'硬币',
    useSum:'120.00',
    remainSum:'0.00',
    basicSum:'0.00',
    useDate:'2019-05-14'
    },
 {
     type:'纸币',
     useSum:'1200.00',
     remainSum:'100.00',
     basicSum:'/',
     useDate:'2019-05-14'
     }
 ]

我修改数组数据，本来想直接把useSum，remainSum，basicSum直接转为数字
但是它可能返回‘/’，我应该这么设置，用正则吗

Answer 1

• 方案一：不改变原始数组的值达到替换效果

let util = {
    /**
     * 原始数组不被修改，将返回一个新数组，新数组只有指定切换的属性和原始数组不一致
     * @param arr  - 需要置换的数组，此方法将直接在原始数组上修改数据
     * @param keys - 需要处理的对象属性
     *
     * @return - 返回一个新数组
     */
    convert : function(arr, keys) {
        if (keys instanceof Array) {
            keys = new this.Set(keys);
        }
        let me = this;
        let newArray = [];
        arr.forEach(function(v) {
            let newObject = {};
            newArray.push(newObject);
            for (let o in v) {
                let vv = v[o];
                if (keys.contains(o)) {
                    vv = me.dealDigital(vv);
                }
                newObject[o] = vv;
            }
        });
        return newArray;
    },
    dealDigital:function(orig) {
        if (orig.length === 1) {
            var value = this.zeroMap[orig];
            if (value) return value;
            return "0.0" + orig;
        } else if (orig.length === 2) {
            return "0." + orig;
        } else {
            return orig.substring(0, orig.length - 2) + "." + orig.substring(orig.length - 2);
        }
    },
    Set:function(arr) {
        if (this instanceof util.Set) {
            this.map = {};
            let me = this;
            arr.forEach(function(o) {
                me.map[o] = true;
            });
            this.contains = function(key) {
                return this.map[key];
            }
        } else {
            return new util.Set(arr);
        }
    },
    zeroMap : {"/":"0.00", "0":"0.00"}
};


//数据
let aaa = [
    {
        type:'硬币',
        useSum:'12000',
        remainSum:'0',
        basicSum:'0',
        useDate:'2019-05-14'},
    {
        type:'纸币',
        useSum:'120000',
        remainSum:'10000',
        basicSum:'/',
        useDate:'2019-05-14'
    }
];

//测试调用
let bbb = util.convert(aaa, ["useSum", "remainSum", "basicSum"]);

//打印，得到想要的目标
console.log(bbb);
//aaa无任何变化
console.log(aaa);

• 方案二：直接在原始数组上改变

let util = {
    /**
     * 原始数组将被修改，并且返回原始数组
     * @param arr  - 需要置换的数组，此方法将直接在原始数组上修改数据
     * @param keys - 需要处理的对象属性
     *
     * @return 返回原始数组arr
     */
    convert : function(arr, keys) {
        if (keys instanceof Array) {
            keys = new this.Set(keys);
        }
        let me = this;
        arr.forEach(function(v) {
            for (let o in v) {
                if (keys.contains(o)) {
                    v[o] = me.dealDigital(v[o]);
                }
            }
        });
        return arr;
    },
    dealDigital:function(orig) {
        if (orig.length === 1) {
            var value = this.zeroMap[orig];
            if (value) return value;
            return "0.0" + orig;
        } else if (orig.length === 2) {
            return "0." + orig;
        } else {
            return orig.substring(0, orig.length - 2) + "." + orig.substring(orig.length - 2);
        }
    },
    Set:function(arr) {
        if (this instanceof util.Set) {
            this.map = {};
            let me = this;
            arr.forEach(function(o) {
                me.map[o] = true;
            });
            this.contains = function(key) {
                return this.map[key];
            }
        } else {
            return new util.Set(arr);
        }
    },
    zeroMap : {"/":"0.00", "0":"0.00"}
};


//数据
let aaa = [
    {
        type:'硬币',
        useSum:'12000',
        remainSum:'0',
        basicSum:'0',
        useDate:'2019-05-14'},
    {
        type:'纸币',
        useSum:'120000',
        remainSum:'10000',
        basicSum:'/',
        useDate:'2019-05-14'
    }
];

//测试调用
let bbb = util.convert(aaa, ["useSum", "remainSum", "basicSum"]);

//打印，得到想要的目标
console.log(bbb);
//aaa已经被改变
console.log(aaa);

希望对你有帮助