已经解决了, 原来是这样写的
[{"id":"4726c049b9719a3a","type":"function","z":"2359a6f.6d6f85a","name":"Subtraction","func":"msg.payload = msg.payload = Number(msg.payload["sensor.zhi_neng_guang_gan_wen_du_ji_zigbeeban_temperature"]) - Number(msg.payload["input_number.room1_temp"]);\nmsg.topic = "Number";\nreturn msg;","outputs":2,"noerr":0,"initialize":"","finalize":"","libs":[],"x":750,"y":120,"wires":[["4f60921e7fa4482c"],[]]}]
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