require is not defined

script src="../../js/realtime.browser.min.js" type="text/javascript" charset="utf-8"

只引入了这个JS文件

var Realtime=AV.Realtime;
var TextMessage=AV.TextMessage;
var realtime = new Realtime({
appId: 'QmCPoKumrB****zjnECAe9-gzGzoHsz',
appKey: 'o5umgyCA****toO2s5P4',
});
var { Event } = require('leancloud-realtime');
// Jerry 登录
realtime.createIMClient('Jerry').then(function(jerry) {
jerry.on(Event.MESSAGE, function(message, conversation) {
console.log('Message received: ' + message.text);
});
}).catch(console.error);