mui在线预览pdf

js文件上传不了
import PahoMQTT from '@/common/js/paho-mqtt-min.js'
let client = new PahoMQTT.Client("mqtt.syniot.cn", 443, 'wx_' + Math.random().toString(16).substr(2, 8))
client.connect({
//timeout: 4000,
useSSL: true,
userName: "syniot",
password: "syniot",
cleanSession: true,
keepAliveInterval: 5,
reconnect: true,
mqttVersion: 4,
onSuccess: function() {
console.log('connected123')
setInterval(function() {
uni.showToast({
title: 'connected'
})
}, 2000)

            //监听关闭  
            client.onConnectionLost = function(responseObject) {  
                if (responseObject.errorCode !== 0) {  
                console.log("onConnectionLost:" + responseObject.errorMessage);  
                }  
            }     
            },  
            onFailure: function(err) {  
                console.log(JSON.stringify(err))  
                console.log('连接失败111')  
                setInterval(function() {  
                    uni.showToast({  
                        title: '连接失败',  
                        icon: 'none'  
                    })  
                }, 5000)  
            }  
        })