javascript发送post请求(json格式)

JS发送json格式的POST请求方法：https://www.jb51.net/article/137354.htm

https://zhidao.baidu.com/question/1052739043914106939.html

https://blog.csdn.net/bhszzy/article/details/107480118

 https://www.cnblogs.com/andy9468/p/4243521.html

https://www.cnblogs.com/dingjiaoyang/p/11022412.html