如何用js控制读取json文件数据，，也就是选取部分json数据

Question

有一个相对比较大的json文件（这个是外部json文件），用D3做出如图所示的关系图，，，，但是，，我只想以某一个人为中心做他的关系图，，需要怎么操作数据？？？？？？？？？？

json数据如下

 {
"nodes":[
{ "name": "云天河"   , "image" : "tianhe.png" },
{ "name": "韩菱纱"   , "image" : "lingsha.png" },
{ "name": "柳梦璃"   , "image" : "mengli.png" },
{ "name": "慕容紫英" , "image" : "ziying.png" },
{ "name": "云天青" , "image" : "tianqing.png" },
{ "name": "夙玉" , "image" : "suyu.png" },
{ "name": "玄霄" , "image" : "xuanxiao.png" },
{ "name": "夙瑶" , "image" : "suyao.png" },
{ "name": "太清" , "image" : "taiqing.png" },
{ "name": "宗炼" , "image" : "zonglian.png" },
{ "name": "婵幽" , "image" : "chanyou.png" },
{ "name": "奚仲" , "image" : "xizhong.png" },
{ "name": "归邪" , "image" : "guixie.png" }
],
"edges":[
{ "source": 0 , "target": 1 , "relation":"挚友" },
{ "source": 0 , "target": 2 , "relation":"挚友" },
{ "source": 0 , "target": 3 , "relation":"挚友" },
{ "source": 1 , "target": 2 , "relation":"挚友" },
{ "source": 1 , "target": 3 , "relation":"挚友" },
{ "source": 2 , "target": 3 , "relation":"挚友" },
{ "source": 0 , "target": 4 , "relation":"父子" },
{ "source": 0 , "target": 5 , "relation":"母子" },
{ "source": 4 , "target": 5 , "relation":"夫妻" },
{ "source": 0 , "target": 6 , "relation":"义兄弟" },
{ "source": 4 , "target": 6 , "relation":"同门" },
{ "source": 5 , "target": 6 , "relation":"同门" },
{ "source": 4 , "target": 7 , "relation":"同门" },
{ "source": 5 , "target": 7 , "relation":"同门" },
{ "source": 6 , "target": 7 , "relation":"同门" },
{ "source": 4 , "target": 8 , "relation":"师徒" },
{ "source": 5 , "target": 8 , "relation":"师徒" },
{ "source": 6 , "target": 8 , "relation":"师徒" },
{ "source": 7 , "target": 8 , "relation":"师徒" },
{ "source": 8 , "target": 9 , "relation":"同门" },
{ "source": 3 , "target": 9 , "relation":"师徒" },
{ "source": 2 , "target": 10 , "relation":"母子" },
{ "source": 10 , "target": 11 , "relation":"主臣" },
{ "source": 10 , "target": 12 , "relation":"主臣" },
{ "source": 11 , "target": 12 , "relation":"同僚" }
]
}

`原图如下```![图片说明](https://img-ask.csdn.net/upload/201704/18/1492502984_150312.png)

Answer 1

把json对象转为js对象，进行数据整理，并保存起来。