使用开发者工具调试时，udpSocket.onMessage可以发送也能接收UDP广播包和指定ip的UDP包。但预览时可以发送成功，接收不到udp包。为什么？ var udp = wx.createUDPSocket(); if(udp == null){ console.log("udp建立不成功") return ; } var that = this; const loactionPort = udp.bind(28266); var testData = loactionPort; that.setData({ testData: testData}); udp.onListening(function(res) { }); udp.onMessage(function(res) { console.log(res); var remoteInfo = new Object; var ipAddr = res.remoteInfo.address; var port = res.remoteInfo.port; var str = ""; for (var i = 0; i < res.message.data.length; i++) { str = str + String.fromCharCode(res.message.data[i]); } console.log(str); var testData = str; testData = "str"; that.setData({testData:testData}); var msg = JSON.parse(str); remoteInfo.ipAddr = ipAddr; remoteInfo.port = port; remoteInfo.msg = msg; that.setData({ remoteInfo: remoteInfo }); console.log(that.data.remoteInfo); });