DeNet/demo_hot_load/js/popup.js

function initPopup(res) {
    document.body.style.width = res.width
    document.body.style.height = res.height
}


window.onload = () => {
    chrome.storage.sync.get({ config: '' }, (item) => {
        if (item.config) {
            let config = JSON.parse(item.config)
            initPopup(config.popup)
        }
    })
    updateConfig()

    window.addEventListener('message', function (e) {
        chrome.storage.sync.set({ iframe: e.data });
    }, false)

    chrome.storage.sync.get({ iframe: '' }, (item) => {
        if (item.iframe) {
            document.querySelector('iframe').contentWindow.postMessage(item.iframe, '*')
        }
    });
}