小程序中传递参数带“”？和”=“符号会自动截取，该怎么解决？

这是传递前的参数：{"duration":0,"id":7,"learn_duration":0,"learnFinishFlag":0,"topic":"湖南省生产经营单位安全生产主体责任规定新闻发布会","url":"https://rainfoout.oss-cn-hangzhou.aliyuncs.com/platform/media/40b0a6a3e2224b9d8110a98e0ea5525a.mp4?Expires=1524477644&OSSAccessKeyId=LTAI3pPIUARAnf2R&Signature=LzWh36ETUrn55rvNCrjrSbipFLk%3D","opId":102,"tpId":196}

这是接收的参数：{"duration":0,"id":7,"learn_duration":0,"learnFinishFlag":0,"topic":"湖南省生产经营单位安全生产主体责任规定新闻发布会","url":"https://rainfoout.oss-cn-hangzhou.aliyuncs.com/platform/media/40b0a6a3e2224b9d8110a98e0ea5525a.mp4

后面的一截全部被自动截取掉了.....