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原文

fetch("http:/example.com", {method: "POST",  body: JSON.stringify(    {      uname: uname,      password: password          }  )}).then((response) => response.json()).then((responseData) => {  AlertIOS.alert(      "POST Response",      "Response Body -> " + JSON.stringify(responseData.body)  )}).done();       this.props.navigation.navigate("Home")   };

修改后的  response.text()代替response.json()

fetch("http:/example.com", {method: "POST",  body: JSON.stringify(    {      uname: uname,      password: password          }  )}).then((response) => response.text()).then((responseData) => {  AlertIOS.alert(      "POST Response",      "Response Body -> " + responseData  )}).done();       this.props.navigation.navigate("Home")   };