Subscribe to browsers using Javascript with MQTT

At MQTT, I'm thinking about using JavaScript to subscribe to my browser.
JavaScript sources include:
The mqttws31.js file is already in the same directory as index2.html.
Nothing happens on the browser, and you can also connect to the MQTT server from the web console. No action appears to have occurred.

// MQTT Clients
varclient;
// Specify ClientID
varclientId = 'clientid-123456789';
// Connecting to Sango
function connect(){
    var user_name = 'AAAAAA@github';
    var pass = '**********';
    var wsurl='ws://lite.mqtt.shiguredo.jp/mqtt';
    // Create MQTT Client from WebSocketURL and ClientID
    client=new Paho.MQTT.Client(wsurl,clientId);
    // CONNECTION
    client.connect({
        userName —user_name,
        password:pass,
        onSuccess:onConnect,
        onFailure:failConnect
    });
}
// connection failure
functionfailConnect(e){
    console.log('connect failed');
    console.log(e);
}
// Connection Successful
function onConnect() {
    console.log('onConnect');
}

javascript

2022-09-30 20:10