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使用nodejs和xml2js模塊。我正在讀取一個XML文件,並在xml轉換爲json對象後嘗試發出一個事件。我的代碼如下所示:如何將範圍傳遞給nodejs中的回調函數?
var fs = require('fs'),
util = require('util'),
events = require('events'),
xml2js = require('xml2js');
var CIRCUITMODELSFILENAME = "ControlCircuitModels.xml";
var CIRCUITPARTMODELSFILENAME = "ControlCircuitParts.xml";
var circuitModels, circuitPartModels;
function ModelController() {
if (false === (this instanceof ModelController)) {
return new ModelController();
}
events.EventEmitter.call(this);
};
util.inherits(ModelController, events.EventEmitter);
ModelController.prototype.load = function (baseDir) {
var parser = new xml2js.Parser({
normalize: true,
trim: true,
explicitArray: false
});
fs.readFile(baseDir + "/" + CIRCUITMODELSFILENAME, function (err, data) {
parser.parseString(data, function (err, result) {
circuitModels = result;
console.log('circuit models loaded');
parser.reset();
fs.readFile(baseDir + "/" + CIRCUITPARTMODELSFILENAME, function (err, data) {
parser.parseString(data, function (err, result) {
circuitPartModels = result;
console.log('circuit part models loaded');
moduleReady = true;
this.emit("modelsloaded", null);
});
});
});
});
};
// public interface
exports.ModelController = ModelController;
問題是發生事件時的範圍丟失。
this.emit("modelsloaded", null);
這沒有從EventEmitter繼承發射。
如何將範圍傳遞給parser.parseString函數?
感謝 克里斯