大约有 1,500 项符合查询结果（耗时：0.0088秒） [XML]
MQTT报文多个数据的提取 - App Inventor 2 拓展 - 清泛IT社区，为创新赋能！
...p;]
}
见上面代码块，解析json，拿出数据项，是一个列表，拿出第一项目中的value，结果是：75.45
要取其他项的数据，改动上面的索引值即可。
其他类似的帖子：https://bbs.tsingfun.com/thread-2631-1-1.html
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