How to use the puppeteer/DeviceDescriptors.forEach function in puppeteer

} catch (error) {
            await browser.close();
            errorHandler(error);
        }
    } else {
        const browser = await puppeteer.launch({
            headless,
            args: sandbox ? undefined : ['--no-sandbox'],
        });
        const page = await browser.newPage();
        try {
            await page.emulate(devices[phone]);
        } catch (error) {
            console.log('可能错误： 1. 你输入的机型不存在 2.你输入的机型格式有误 3.暂不支持该机型');
            console.log('支持的机型有：');
            devices.forEach(function(item) {
                console.log(item.name);
            });
            await browser.close();
            errorHandler(error);
        }
        try {
            let client;

            if (customPath) {
                const customPathFunction = require(customPath);
                await customPathFunction(page, logInfo);
            }

            // If we want tu use a custom url, reach it before making metrics.
            logInfo(`Testing ${url}...`);