javascript - 舍入 Json 对象的所有对象中的小数值

Question

这是我的 JSON 字符串

[{"$id":"1","GeoName":"EAST","Value2":87.88221970554928,"Value4":90.71955219607294,"Value1":18.44377295716579,"Value3":16.732108234801206},{"$id":"2","GeoName":"WEST","Value2":87.88221970554928,"Value4":90.71955219607294,"Value1":18.44377295716579,"Value3":16.732108234801206}]"

这是我在 Stringyfying 之前的 JSONobject

**MyObj:**


0:Object
    $id:"1"
    Value1:18.44377295716579
    GeoName:"EAST"
    Value2:87.88221970554928
    Value3:16.732108234801206
    Value4:90.71955219607294
1:Object
    $id:"2"
    Value1:18.44377295716579
    GeoName:"WEST"
    Value2:87.88221970554928
    Value3:16.732108234801206
    Value4:90.71955219607294

有没有一种方法可以将我的 JSON 的每个对象中的所有值(或什至单独的值 1、值 2...)四舍五入到小数点后 2 位？

喜欢

0:Object
        $id:"1"
        Value1:18.44
        GeoName:"EAST"
        Value2:87.89
        Value3:16.73
        Value4:90.72
1:Object
        $id:"2"
        Value1:18.44
        GeoName:"WEST"
        Value2:87.89
        Value3:16.73
        Value4:90.71

我试过用

Obj = JSON.parse(JSON.stringify(MyObj, function (GeoName, Value1) {
                return Value1.toFixed ? Number(Value1.toFixed(2)) : Value1;
            }));

这对我不起作用。

有没有办法通过调整上面的代码行来实现这一点，或者是否有更好的方法来解决这个问题？

Edit1(在wostex建议的方法之后)

var numKeys = ['ShareValue','ReachValue','DepthValue','WidthValue'];
MyObj=Obj.map(e => Object.assign(e,Object.keys(e).filter(k => numKeys.includes(k)).map(v => Object.assign({[v]: parseFloat(e[v]).toFixed(2)}))))

这是我的对象的样子

0:Object
       0:Object
        ReachValue:87.88
       1:Object
        DepthValue:16.73
       2:Object
        ShareValue:18.44
       3:Object
        WidthValue:90.71
        $id:"1"
        ShareValue:18.44377295716579
        GeoName:"EAST"
        ReachValue:87.88221970554928
        DepthValue:16.732108234801206
        WidthValue:90.71955219607294

编辑2

Obj = JSON.parse(JSON.stringify(BubbleObj));
var numKeys = ['ShareValue','ReachValue','DepthValue','WidthValue'];
            var MyObj=Obj.map(e => Object.assign(e,Object.keys(e).filter(k => numKeys.includes(k)).map(v => Object.assign({[v]: parseFloat(e[v]).toFixed(2)}))))

这里 Obj 有问题第一行的 JSON 字符串，BubbleObj 有我在问题中提到的 MyObj 对象。

Answer 1

最简单的方法就是使用 map - 只要您的 Value1-4 始终被调用即可

var input = [{"$id":"1","GeoName":"EAST","Value2":87.88221970554928,"Value4":90.71955219607294,"Value1":18.44377295716579,"Value3":16.732108234801206},{"$id":"2","GeoName":"WEST","Value2":87.88221970554928,"Value4":90.71955219607294,"Value1":18.44377295716579,"Value3":16.732108234801206}];

var output = input.map(function(e) {
    return {
      $id: e.$id,
      GeoName: e.GeoName,
      Value1: Math.round(e.Value1*100) /100,
      Value2: Math.round(e.Value2*100) /100,
      Value3: Math.round(e.Value3*100) /100,
      Value4: Math.round(e.Value4*100) /100
    }
});

console.log(output);

如果您不想对其进行硬编码，您可以寻找以 Value 开头的任何键 - 它有点复杂。

var input = [{"$id":"1","GeoName":"EAST","Value2":87.88221970554928,"Value4":90.71955219607294,"Value1":18.44377295716579,"Value3":16.732108234801206},{"$id":"2","GeoName":"WEST","Value2":87.88221970554928,"Value4":90.71955219607294,"Value1":18.44377295716579,"Value3":16.732108234801206}];

var output = input.map(function(e) {
    return Object.keys(e).reduce(function(p,n){
       if(n.startsWith("Value"))
           p[n] = Math.round(e[n]*100)/100;
       else
           p[n] = e[n];
       return p;
    },{})
});

console.log(output);