前端性能监控

1、首屏加载时间

     var timeStart = Date.now()
        document.addEventListener('DOMContentLoaded', function () {
            console.log("DOM 挂载时间: ", Date.now() - timeStart)
        })
        window.addEventListener('load', function () {
            console.log("所有资源加载完成时间: ", Date.now() - timeStart);
            // 性能日志上报
        });  

2、https://www.cnblogs.com/accordion/p/8366692.html

npm 包https://www.npmjs.com/package/auto-compute-first-screen-time

参考博客

https://segmentfault.com/a/1190000013532766