我使用D3有一个类似下面的JSON树结构。我正在保存到Mongo数据库，但我正在尝试删除x，y，id，xo和yo等不必要的字段。我想知道是否有任何使用任何自然的d3.js功能。
{
"name": "law",
"children": [
{
"name": "criminal",
"children": [
{
"name": "drugs",
"children": [
{
"name": "abuse",
"depth": 3,
"x": 14.5161295,
"y": 870,
"id": 17,
"x0": 14.5161295,
"y0": 870,
"children": [
{
"name": "asd",
"id": "aa909548-9200-45d6-86e9-f02708bfb70d",
"depth": 4,
"_children": null,
"x": 14.5161295,
"y": 1160,
"x0": 14.5161295,
"y0": 1160
}
]
},
{
"name": "trafficking",
"depth": 3,
"x": 29.032259,
"y": 870,
"id": 18,
"x0": 29.032259,
"y0": 870
}
],
"depth": 2,
"x": 21.774193,
"y": 580,
"id": 19,
"x0": 21.774193,
"y0": 580
},
{
"name": "sexual harrasement",
"children": [
{
"name": "harrasement in education",
"depth": 3,
"x": 58.064518,
"y": 870,
"id": 15,
"x0": 58.064518,
"y0": 870
},
{
"name": "harrasement in workplace",
"depth": 3,
"x": 72.58064,
"y": 870,
"id": 14,
"x0": 72.58064,
"y0": 870
}
],
"depth": 2,
"x": 65.32258,
"y": 580,
"id": 16,
"x0": 65.32258,
"y0": 580
},
{
"name": "violent",
"children": [
{
"name": "acts intended to cause injury",
"depth": 3,
"x": 101.6129,
"y": 870,
"id": 12,
"x0": 101.6129,
"y0": 870
},
{
"name": "robbery",
"depth": 3,
"x": 116.129036,
"y": 870,
"id": 11,
"x0": 116.129036,
"y0": 870
},
{
"name": "sexual assault",
"depth": 3,
"x": 130.64516,
"y": 870,
"id": 10,
"x0": 130.64516,
"y0": 870
}
],
"depth": 2,
"x": 116.129036,
"y": 580,
"id": 13,
"x0": 116.129036,
"y0": 580
}
],
"depth": 1,
"x": 68.951614,
"y": 290,
"id": 20,
"x0": 68.951614,
"y0": 290
},
{
"name": "family",
"children": [
{
"name": "adoption",
"depth": 2,
"x": 152.41936,
"y": 580,
"id": 2,
"x0": 152.41936,
"y0": 580
},
{
"name": "child abuse",
"depth": 2,
"x": 166.93549,
"y": 580,
"id": 1,
"x0": 166.93549,
"y0": 580
},
{
"name": "divorce",
"children": [
{
"name": "contested-divorce",
"children": [
{
"name": "mediation",
"depth": 4,
"x": 152.41936,
"y": 1160,
"id": 6,
"x0": 152.41936,
"y0": 1160
},
{
"id": "2.1.1.1",
"name": "trial",
"depth": 4,
"x": 166.93549,
"y": 1160,
"x0": 166.93549,
"y0": 1160
}
],
"depth": 3,
"x": 159.67741,
"y": 870,
"id": 7,
"x0": 159.67741,
"y0": 870
},
{
"name": "no-fault divorce",
"children": [
{
"name": "custody",
"depth": 4,
"x": 195.96774,
"y": 1160,
"id": 4,
"x0": 195.96774,
"y0": 1160
},
{
"name": "division of marital assets",
"depth": 4,
"x": 210.48387,
"y": 1160,
"id": 3,
"x0": 210.48387,
"y0": 1160
}
],
"depth": 3,
"x": 203.2258,
"y": 870,
"id": 5,
"x0": 203.2258,
"y0": 870
}
],
"depth": 2,
"x": 181.45161,
"y": 580,
"id": 8,
"x0": 181.45161,
"y0": 580
}
],
"depth": 1,
"x": 166.93549,
"y": 290,
"id": 9,
"x0": 166.93549,
"y0": 290
}
],
"x0": 117.94355,
"y0": 0,
"depth": 0,
"x": 117.94355,
"y": 0,
"id": 21
}
答案 0 :(得分：1)
首先，我完全赞同Gerardo的comment声明这与D3中的特殊情况无关，也不是D3是解决这个问题的一个非常好的选择。事实证明，这可以在纯JavaScript中轻松完成。其次，虽然从你的问题中并不完全清楚，但我认为你是用文字符号而不是JSON字符串处理对象。
基本上有两种方法可以完成这项工作：
使用delete运算符递归遍历树，以消除您在保存的结果JSON字符串中不所需的属性。有很多种方法可以进行实际的递归，其中很多都被类似的问题广泛涵盖，所以我将它放在一边。
由于您明确要求将树存储为JSON，因此可以使用replacer参数，该参数可作为JSON.stringify()的第二个参数提供：
JSON.stringify(value[, replacer[, space]])[...]
替换者 | 可选
一个改变字符串化过程行为的函数，或一个String和Number对象数组，用作选择/过滤要包含在JSON中的值对象的属性的白名单串。如果此值为null或未提供，则对象的所有属性都包含在生成的JSON字符串中。
但是，要使其正常工作，您需要指定要包含在输出中的属性的白名单。请注意，这与删除选项1相反。
对于你的情况，这可能是这样的：
JSON.stringify(data, ["name", "depth", "children"]);
var data = {
"name": "law",
"children": [
{
"name": "criminal",
"children": [
{
"name": "drugs",
"children": [
{
"name": "abuse",
"depth": 3,
"x": 14.5161295,
"y": 870,
"id": 17,
"x0": 14.5161295,
"y0": 870,
"children": [
{
"name": "asd",
"id": "aa909548-9200-45d6-86e9-f02708bfb70d",
"depth": 4,
"_children": null,
"x": 14.5161295,
"y": 1160,
"x0": 14.5161295,
"y0": 1160
}
]
},
{
"name": "trafficking",
"depth": 3,
"x": 29.032259,
"y": 870,
"id": 18,
"x0": 29.032259,
"y0": 870
}
],
"depth": 2,
"x": 21.774193,
"y": 580,
"id": 19,
"x0": 21.774193,
"y0": 580
},
{
"name": "sexual harrasement",
"children": [
{
"name": "harrasement in education",
"depth": 3,
"x": 58.064518,
"y": 870,
"id": 15,
"x0": 58.064518,
"y0": 870
},
{
"name": "harrasement in workplace",
"depth": 3,
"x": 72.58064,
"y": 870,
"id": 14,
"x0": 72.58064,
"y0": 870
}
],
"depth": 2,
"x": 65.32258,
"y": 580,
"id": 16,
"x0": 65.32258,
"y0": 580
},
{
"name": "violent",
"children": [
{
"name": "acts intended to cause injury",
"depth": 3,
"x": 101.6129,
"y": 870,
"id": 12,
"x0": 101.6129,
"y0": 870
},
{
"name": "robbery",
"depth": 3,
"x": 116.129036,
"y": 870,
"id": 11,
"x0": 116.129036,
"y0": 870
},
{
"name": "sexual assault",
"depth": 3,
"x": 130.64516,
"y": 870,
"id": 10,
"x0": 130.64516,
"y0": 870
}
],
"depth": 2,
"x": 116.129036,
"y": 580,
"id": 13,
"x0": 116.129036,
"y0": 580
}
],
"depth": 1,
"x": 68.951614,
"y": 290,
"id": 20,
"x0": 68.951614,
"y0": 290
},
{
"name": "family",
"children": [
{
"name": "adoption",
"depth": 2,
"x": 152.41936,
"y": 580,
"id": 2,
"x0": 152.41936,
"y0": 580
},
{
"name": "child abuse",
"depth": 2,
"x": 166.93549,
"y": 580,
"id": 1,
"x0": 166.93549,
"y0": 580
},
{
"name": "divorce",
"children": [
{
"name": "contested-divorce",
"children": [
{
"name": "mediation",
"depth": 4,
"x": 152.41936,
"y": 1160,
"id": 6,
"x0": 152.41936,
"y0": 1160
},
{
"id": "2.1.1.1",
"name": "trial",
"depth": 4,
"x": 166.93549,
"y": 1160,
"x0": 166.93549,
"y0": 1160
}
],
"depth": 3,
"x": 159.67741,
"y": 870,
"id": 7,
"x0": 159.67741,
"y0": 870
},
{
"name": "no-fault divorce",
"children": [
{
"name": "custody",
"depth": 4,
"x": 195.96774,
"y": 1160,
"id": 4,
"x0": 195.96774,
"y0": 1160
},
{
"name": "division of marital assets",
"depth": 4,
"x": 210.48387,
"y": 1160,
"id": 3,
"x0": 210.48387,
"y0": 1160
}
],
"depth": 3,
"x": 203.2258,
"y": 870,
"id": 5,
"x0": 203.2258,
"y0": 870
}
],
"depth": 2,
"x": 181.45161,
"y": 580,
"id": 8,
"x0": 181.45161,
"y0": 580
}
],
"depth": 1,
"x": 166.93549,
"y": 290,
"id": 9,
"x0": 166.93549,
"y0": 290
}
],
"x0": 117.94355,
"y0": 0,
"depth": 0,
"x": 117.94355,
"y": 0,
"id": 21
};
var json = JSON.stringify(data, ["name", "depth", "children"]);
console.log(json);