ajax同步异步请求与JSON数据解析

今天接到一个任务，将json文件中的数据读取出来，填到echars的环形图中。。。。

中间遇到了很多问题，整理一下

json文件：

{"circle": [{"name": "名称1","value": 15}, {"name": "名称2","value": 25}, {"name": "名称3","value": 35}],"table": [{"metting": [{"name": "会议室1","number": 3}, {"name": "会议室2","number": 1}]}, {"court": [{"name": "会议室3","number": 7}, {"name": "会议室4","number": 14}]}]}