我正在使用GoInstant开发一款应用,但键和频道之间的差异并不是很明显。我应该何时使用密钥与渠道?
答案 0 :(得分:7)
键:与键值存储一样,Key对象是您在其中管理和监视GoInstant中的值的接口。您应该将它们用于CRUD(创建,读取,更新删除)。
关键示例:
// We create a new key using our room object
var movieName = yourRoom.key(‘movieName’);
// Prepare a handler for our `on` set event
function setHandler(value) {
console.log(‘Movie has a new value’, value);
}
// Now when the value of our key is set, our handler will fire
movieName.on(‘set’, setHandler);
// Ready, `set`, GoInstant :)
movieName.set('World War Z', function(err) {
if (!err) alert('Movie set successfully!')
}
渠道:代表全双工消息传递界面。想象一下多客户端发布/订阅系统。频道不存储数据,您无法从频道中检索消息,您只能接收它。您应该使用它在共享会话的客户端之间传播事件。
频道示例:
var mousePosChannel = yourRoom.channel('mousePosChannel');
// When the mouse moves, broadcast the mouse co-ordinates in our channel
$(window).on('mousemove', function(event) {
mousePosChannel.message({
posX: event.pageX,
posY: event.pageY
});
});
// Every client in this session can listen for changes to
// any users mouse location
mousePosChannel.on('message', function(msg) {
console.log('A user in this room has moved there mouse too', msg.posX, msg.posY);
})
您可以在此处找到官方文档: