如何用js控制读取json文件数据，，也就是选取部分json数据

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)

把json对象转为js对象，进行数据整理，并保存起来。

var a=你的json

jQuery中有一个简单的方法 $.getJSON() 可以实现 function jsonStr() {
$.getJSON("json数据对象", function(data) {
$.each(data.comments, function(i, item) {
//业务逻辑处理
});
}
$.each()方法接受两个参数，第一个是需要遍历的对象集合（JSON对象集合），第二个是用来遍历的方法，这个方法又接受两个参数，第一个是遍历的index，第二个是当前遍历的值

source 全部改成0就可以了
source代表第几个原节点

这个链接是让你如何读取json数据：http://blog.csdn.net/xuanzhangran/article/details/60866665

看来我就不多说什么了吧，就是把json转换，然后提某个你想要的