How to use the cordova/channel.create function in cordova

addDocumentEventHandler: function (event) {
        return (documentEventHandlers[event] = channel.create(event));
    },
    removeWindowEventHandler: function (event) {

function InAppBrowser() {
       this.channels = {
            'loadstart': channel.create('loadstart'),
            'loadstop' : channel.create('loadstop'),
            'loaderror' : channel.create('loaderror'),
            'exit' : channel.create('exit')
       };
    }

function InAppBrowser() {
   this.channels = {
        'loadstart': channel.create('loadstart'),
        'loadstop' : channel.create('loadstop'),
        'loaderror' : channel.create('loaderror'),
        'exit' : channel.create('exit')
   };
}

addWindowEventHandler: function (event) {
        return (windowEventHandlers[event] = channel.create(event));
    },
    addStickyDocumentEventHandler: function (event) {

addDocumentEventHandler: function (event) {
                return (documentEventHandlers[event] = channel.create(event));
            },
            removeWindowEventHandler: function (event) {

function InAppBrowser() {
   this.channels = {
        'loadstart': channel.create('loadstart'),
        'loadstop' : channel.create('loadstop'),
        'loaderror' : channel.create('loaderror'),
        'exit' : channel.create('exit')
   };
   this._alive = true;
}

addDocumentEventHandler:function(event) {
        return (documentEventHandlers[event] = channel.create(event));
    },
    removeWindowEventHandler:function(event) {

function InAppBrowser () {
        this.channels = {
            'loadstart': channel.create('loadstart'),
            'loadstop': channel.create('loadstop'),
            'loaderror': channel.create('loaderror'),
            'exit': channel.create('exit')
        };
    }

addWindowEventHandler:function(event) {
        return (windowEventHandlers[event] = channel.create(event));
    },
    addStickyDocumentEventHandler:function(event) {

function InAppBrowser() {
   this.channels = {
        'loadstart': channel.create('loadstart'),
        'loadstop' : channel.create('loadstop'),
        'loaderror' : channel.create('loaderror'),
        'exit' : channel.create('exit')
   };
}