de-net/src/entry/content_iframe.js

console.log('content_iframe', window.location)

const _historyWrap = function (type) {
    const orig = history[type];
    const e = new Event(type);
    return function () {
        const rv = orig.apply(this, arguments);
        e.arguments = arguments
        window.dispatchEvent(e)
        return rv
    }
}
history.pushState = _historyWrap('pushState')
history.replaceState = _historyWrap('replaceState')

window.addEventListener('hashchange', function () {
    getRouterType()
})

window.addEventListener('popstate', function () {
    getRouterType()
})

window.addEventListener('pushState', function () {
    getRouterType()
})

window.addEventListener('replaceState', function () {
    getRouterType()
})

let router_data = []

const getRouterType = () => {
    let key = history?.state?.key
    if (!key) {
        return
    }
    let index = router_data.indexOf(key)
    if (index < 0) {
        // 没有此页面
        router_data.push(key)
        index = router_data.indexOf(key)
    }
    let type = ''
    if (router_data.length == 1) {
        type = 'first&last'
    } else if (index + 1 == router_data.length) {
        type = 'last'
    } else if (index == 0) {
        type = 'first'
    }
    return type
}