我有一个小问题。我以为我已经了解事件处理，但现在我不这么认为了。
我创建了一个 Chrome Event()：
this.onReadLine = new chrome.Event();
此事件在函数中调度：
this.onReadLine.dispatch(line);
在调度指令之前，我尝试记录调度指令的参数“line”。没问题，“线”存在。
直接使用代码，您会发现这部分：
connection.onReadLine.addListener(function(line) {
logJSON(line);
});
这是每次onReadLine调度事件时必须触发的内容。
问题是，onReadLine只有在我按下或释放代码末尾定义的按钮“#dimmer1_Chrome_Input”时才会调度事件。我哪里错了？
我的完整代码在这里。与问题相关的部分用 ////\///\/\///\\ 行突出显示。
// Serial used from Arduino board
const Arduino_COM = 'COM3'; // PC
var SerialConnection = function() {
this.connectionId = -1;
this.lineBuffer = "";
this.boundOnDataReceiving = this.onDataReceiving.bind(this);
this.boundOnDataReceivingError = this.onDataReceivingError.bind(this);
this.onConnect = new chrome.Event();
///////////////////////////\\\\\\\\\\\\\\\/////////////\\\\\\\\\\////////\\\\\\\\\\\\////////\\\\\\\\\\//////PROBLEM
this.onReadLine = new chrome.Event();
///////////////////////////\\\\\\\\\\\\\\\/////////////\\\\\\\\\\////////\\\\\\\\\\\\////////\\\\\\\\\\//////PROBLEM
this.onError = new chrome.Event();
};
SerialConnection.prototype.connect = function(Serial_COM_Port) {
chrome.serial.connect(Serial_COM_Port, this.onConnectComplete.bind(this));
};
SerialConnection.prototype.onConnectComplete = function(connectionInfo) {
if (!connectionInfo) {
log("Connection failed.");
return;
}
this.connectionId = connectionInfo.connectionId;
chrome.serial.onReceive.addListener(this.boundOnDataReceiving);
chrome.serial.onReceiveError.addListener(this.boundOnDataReceivingError);
this.onConnect.dispatch();
};
SerialConnection.prototype.send = function(msg) {
if (this.connectionId < 0) {
throw 'Invalid connection';
}
chrome.serial.send(this.connectionId, String_to_ArrayBuffer(msg), function() {});
};
SerialConnection.prototype.onDataReceiving = function(receiveInfo) {
if (receiveInfo.connectionId !== this.connectionId) {
return;
}
this.lineBuffer += ArrayBuffer_to_String(receiveInfo.data);
var index;
while ((index = this.lineBuffer.indexOf('\n')) >= 0) {
var line = this.lineBuffer.substr(0, index + 1);
console.log(line);
///////////////////////////\\\\\\\\\\\\\\\/////////////\\\\\\\\\\////////\\\\\\\\\\\\////////\\\\\\\\\\//////PROBLEM
this.onReadLine.dispatch(line);
///////////////////////////\\\\\\\\\\\\\\\/////////////\\\\\\\\\\////////\\\\\\\\\\\\////////\\\\\\\\\\//////PROBLEM
this.lineBuffer = this.lineBuffer.substr(index + 1);
}
};
SerialConnection.prototype.onDataReceivingError = function(errorInfo) {
if (errorInfo.connectionId === this.connectionId) {
this.onError.dispatch(errorInfo.error);
}
};
SerialConnection.prototype.disconnect = function() {
if (this.connectionId < 0) {
throw 'Invalid connection';
}
chrome.serial.disconnect(this.connectionId, function() {});
};
var connection = new SerialConnection();
connection.onConnect.addListener(function() {
log('connected to: ' + Arduino_COM);
});
///////////////////////////\\\\\\\\\\\\\\\/////////////\\\\\\\\\\////////\\\\\\\\\\\\////////\\\\\\\\\\//////PROBLEM
connection.onReadLine.addListener(function(line) {
logJSON(line);
});
///////////////////////////\\\\\\\\\\\\\\\/////////////\\\\\\\\\\////////\\\\\\\\\\\\////////\\\\\\\\\\//////PROBLEM
connection.connect(Arduino_COM);
function logJSON(result) {
var response = jQuery.parseJSON( result );
dimmer1_state = response.dimmer1_state;
dimmer1_value = response.dimmer1_value;
SerialIn = response.SerialIn;
dimmer1_Chrome_Input = response.dimmer1_Chrome_Input;
temperature1_value = response.temperature1_value;
s=Math.round(dimmer1_value * 80 / 255 + 20);
hsl='hsl(115,'+s+'%,60%)';
if (dimmer1_state == 0)
{
$('#statusCircle').css('fill','hsl(115,20%,60%)');
}
else
{
$('#statusCircle').css('fill', hsl);
};
// Print led Status to HTML buffer area
messaggio = "dimmer1 state: " + dimmer1_state
+ "<br />dimmer1 value: " + dimmer1_value
+ "<br />SerialIn: " + SerialIn
+ "<br />dimmer1_Chrome_Input: " + dimmer1_Chrome_Input
+ "<br />temperature1_value: " + temperature1_value + " °C";
log(messaggio);
};
function log(msg) {
$('#buffer').html(msg);
};
$(function(){
$('#dimmer1_Chrome_Input') .button()
.mousedown(function() {
connection.send("101");
})
.mouseup(function() {
connection.send("100");
});
});