在我的程序的某些地方，如果数据不匹配，我会使用包含脚本的检查：
const a = 1;
//...
//...
if (param1 != 1 && param2 != 3) {
return; // stop script
}
//...
//...
if (param1 != 1 && param2 != 3) {
return; // stop script
}
//...
//...
所以我创建了函数：
function checkIfOk(param1, param2)
{
if (param1 != 1 && param2 != 3) {
return; // stop script
}
}
但现在：
const a = 1;
//...
//...
checkIfOk(param1, param2);
//...
//...
checkIfOk(param1, param2);
//...
//...
不会在错误时暂停该功能。
const a = 1;
//...
//...
return checkIfOk(param1, param2);
//...
//...
return checkIfOk(param1, param2);
//...
//...
这会在任何情况下停止该功能。
我不想要使用throw错误，因为我在函数中使用它，所以程序应该仍在运行。
答案 0 :(得分：0)
您需要返回一个值（例如false和true），并且仅在返回false
e.g。
function checkIfOk(param1, param2)
{
if (param1 != 1 && param2 != 3) {
return false; // stop script
}
return true; // OK!!
}
if(!checkIfOk(param1, param2))
return; //only return if checkIfOk returns false
答案 1 :(得分：0)
这是实现您想要的更快捷方式：
<ion-view class="app-tab" hide-nav-bar="true" view-title="Support">
<ion-content class="padding">
<h3 class="tab-header-text">Live Video Support</h3>
<div id="call-connected">Connected to Live Tech Support</div>
<div id="controls">
<div id="preview" style="float:left;">
<div id="local-media"></div>
<button id="button-preview" style="margin-left:40px;">Preview My Camera</button>
</div>
<div id="call-controls" class="call-button-div">
<i id="button-call" class="icon ion-ios-telephone-outline call-buttons" style="color:green;"></i>
<i id="button-call-end" class="icon ion-ios-telephone-outline call-buttons" style="color:red; display:none;"></i>
</div>
</div>
<div id="spin-wrapper"><ion-spinner name="circles"></ion-spinner></div>
<div id="remote-media">
<div id="video-overlay">Nicholas Kreidberg</div>
</div>
</ion-content>
</ion-view>
我猜在语义上它应该是angular.module('PROJECT_NAME.controllers').controller('SupportVideoCtrl', ['$rootScope', '$scope', '$http', function($rootScope, $scope, $http) {
// instantiate Twilio Programmable Video library
const Video = Twilio.Video;
// setup some vars
var activeRoom;
var previewTracks;
var identity;
var roomName;
// Attach the Tracks to the DOM.
function attachTracks(tracks, container) {
tracks.forEach(function(track) {
container.appendChild(track.attach());
});
}
// Attach the Participant's Tracks to the DOM.
function attachParticipantTracks(participant, container) {
var tracks = Array.from(participant.tracks.values());
attachTracks(tracks, container);
}
// Detach the Tracks from the DOM.
function detachTracks(tracks) {
tracks.forEach(function(track) {
track.detach().forEach(function(detachedElement) {
detachedElement.remove();
});
});
}
// Detach the Participant's Tracks from the DOM.
function detachParticipantTracks(participant) {
var tracks = Array.from(participant.tracks.values());
detachTracks(tracks);
}
// When we are about to transition away from this page, disconnect
// from the room, if joined.
window.addEventListener('beforeunload', leaveRoomIfJoined);
$rootScope.$on('$stateChangeSuccess',
function(event, toState, toParams, fromState, fromParams) {
leaveRoomIfJoined();
}
);
$http.get('TOKEN_URL', function(data) {
}).then(function(data) {
console.log(data);
console.log("Token = " + data.data.token);
//document.getElementById('room-controls').style.display = 'block';
// Bind click event and add token to data attribute
document.getElementById('button-call').addEventListener('click', connect);
document.getElementById('button-call').setAttribute('data-token', data.data.token);
// Connect
connect();
// Bind button to leave Room.
document.getElementById('button-call-end').onclick = function() {
log('Disconnecting...');
document.getElementById('call-connected').style.display = 'none';
document.getElementById('spin-wrapper').style.display = 'none';
document.getElementById('button-preview').style.display = 'block';
document.getElementById('video-overlay').style.display = 'none';
activeRoom.disconnect();
};
});
function connect() {
roomName = 'Support';
log("Joining room '" + roomName + "'...");
token = document.getElementById('button-call').getAttribute('data-token');
console.log("Token: "+token);
var connectOptions = {
name: 'Support',
logLevel: 'debug'
};
if (previewTracks) {
connectOptions.tracks = previewTracks;
}
// Join the Room with the token from the server and the
// LocalParticipant's Tracks.
Video.connect(token, connectOptions).then(roomJoined, function(error) {
log('Could not connect to Twilio: ' + error.message);
});
document.getElementById('call-connected').style.display = 'block';
document.getElementById('spin-wrapper').style.display = 'inline-flex';
document.getElementById('button-preview').style.display = 'none';
}
// Successfully connected!
function roomJoined(room) {
window.room = activeRoom = room;
log("Joined as '" + identity + "'");
document.getElementById('button-call').style.display = 'none';
document.getElementById('button-call-end').style.display = 'inline';
// Attach LocalParticipant's Tracks, if not already attached.
var previewContainer = document.getElementById('local-media');
if (!previewContainer.querySelector('video')) {
attachParticipantTracks(room.localParticipant, previewContainer);
}
// Attach the Tracks of the Room's Participants.
room.participants.forEach(function(participant) {
log("Already in Room: '" + participant.identity + "'");
var previewContainer = document.getElementById('remote-media');
attachParticipantTracks(participant, previewContainer);
});
// When a Participant joins the Room, log the event.
room.on('participantConnected', function(participant) {
//document.getElementById('remote-media').style.display = 'inline';
log("Joining: '" + participant.identity + "'");
});
// When a Participant adds a Track, attach it to the DOM.
room.on('trackAdded', function(track, participant) {
log(participant.identity + " added track: " + track.kind);
var previewContainer = document.getElementById('remote-media');
document.getElementById('spin-wrapper').style.display = 'none';
document.getElementById('video-overlay').style.display = 'flex';
attachTracks([track], previewContainer);
});
// When a Participant removes a Track, detach it from the DOM.
room.on('trackRemoved', function(track, participant) {
log(participant.identity + " removed track: " + track.kind);
detachTracks([track]);
});
// When a Participant leaves the Room, detach its Tracks.
room.on('participantDisconnected', function(participant) {
log("Participant '" + participant.identity + "' left the room");
detachParticipantTracks(participant);
});
// Once the LocalParticipant leaves the room, detach the Tracks
// of all Participants, including that of the LocalParticipant.
room.on('disconnected', function() {
log('Left');
if (previewTracks) {
previewTracks.forEach(function(track) {
track.stop();
});
}
detachParticipantTracks(room.localParticipant);
room.participants.forEach(detachParticipantTracks);
activeRoom = null;
document.getElementById('button-call').style.display = 'inline';
document.getElementById('button-call-end').style.display = 'none';
document.getElementById('spin-wrapper').style.display = 'none';
});
}
// Preview LocalParticipant's Tracks.
document.getElementById('button-preview').onclick = function() {
var localTracksPromise = previewTracks
? Promise.resolve(previewTracks)
: Video.createLocalTracks();
localTracksPromise.then(function(tracks) {
window.previewTracks = previewTracks = tracks;
var previewContainer = document.getElementById('local-media');
if (!previewContainer.querySelector('video')) {
attachTracks(tracks, previewContainer);
}
}, function(error) {
console.error('Unable to access local media', error);
log('Unable to access Camera and Microphone');
});
};
document.getElementById('mute').onclick = function() {
console.dir(room.localParticipant);
room.localParticipant.audioTracks.disable();
};
// Activity log.
function log(message) {
console.dir(message);
return false;
var logDiv = document.getElementById('log');
logDiv.innerHTML += '<p>> ' + message + '</p>';
logDiv.scrollTop = logDiv.scrollHeight;
}
// Leave Room.
function leaveRoomIfJoined() {
if (activeRoom) {
activeRoom.disconnect();
}
}
}]);
，但是呃......