let lastSrc;

// 匹配 Script 標(biāo)簽中的 src
const scriptReg = /\<script.*src=["'](?<src>[^"']+)/gm;

/**
 * 提取服務(wù)器的 Script 標(biāo)簽中的 src
 */
async function extractNewScripts() {
    const html = await fetch('/?_timestamp=' + Date.now()).then(resp => {
        return resp.text()
    })
    scriptReg.lastIndex = 0
    let result = []
    let match;
    while ((match = scriptReg.exec(html))) {
        result.push(match.groups.src)
    }
    return result
}

/**
 * 判斷是否有新版本
 */
async function hasNewVersion() {
    const newScripts = await extractNewScripts()
    if (!lastSrc) {
        lastSrc = newScripts
        return false
    }
    let result = false
    if (lastSrc.length !== newScripts.length) {
        result = true
    }
    for (let i = 0; i < lastSrc.length; i++) {
        if (lastSrc[i] !== newScripts[i]) {
            result = true
            break
        }
    }
    lastSrc = newScripts
    return result
}

/**
 * 自動(dòng)更新定時(shí)器
 */
function autoRefresh() {
    setTimeout(async () => {
        const needUpdate = await hasNewVersion()
        if (needUpdate) {
            const result = confirm('項(xiàng)目發(fā)布新版本，立即更新？')
            if (result) {
                location.reload()
            }
        }
        autoRefresh()
    }, 5000)
}

autoRefresh()

import './auto-update'