Summary
As a front-end developer, we are often concerned with functional realization, but can easily ignore performance optimization. Today you share five practical performance optimization techniques that help you build faster user experience。
It's..
Open
Have you ever experienced a situation where users complain that the website is being loaded too slowly and that the page carton affects the operating experience? In today's internet environment, users ' expectations of web performance are increasing. Studies show that every second of the page loading time increases the conversion rate by 7%。
So, as front-end developers, how can we optimize website performance? Today we share five proven techniques。
Skill one: lazy picture load
Pictures tend to have the largest bandwidth in the web page. Lazy loading ensures that the picture is loaded only when entering the view, significantly reducing the first-screen loading time。
Use intersection observer to achieve laziness:
Co= new interspecio= {
I'm sorry, kids
If (entry. Is intersering)
Co= entry. Target;
Img. Src = img. Dataset. Src;
Observer. Unobserve (img);
I'm not sure;
I'm not sure;
DI'm sorry, i'm sorry
Imageobserver. Observe(img);
I'm not sure;
Skills two: code division and addition as required load
Do not load all codes once. Splits the function by using a code from webpack or vite, using multiple chunks to load as required。
Dynamic import achieves loading on demand:
Co= async()=
CoI'm sorryMport (./heavy-module. Js);
Module. Init();
};
Load when needed
Skill three: treasure resistance and throttle
Frequent event triggers (e. G. Scroll, resize, input) can lead to performance problems. The frequency of the function is controlled by the shivering and throttle。
Wrightened: waiting for some time before execution
Sequel: execute only once within a fixed time interval
Skills iv: reduced reordering and repainting
The dom operation triggers reflow and repaint, which are performance killers. Optimization strategies include:
- batch changes dom to avoid frequent operations
- use css transport instead of top/ left positioning
- set animation elements to fixed or absolute
- use dCannot initialise evolution's mail component
Skills 5: using browser cache
Rationalizing the cache strategy can significantly reduce requests. For static resources, use long-term caches; for HTML files, use consultative caches。
Service worker can achieve a cache strategy
It's..
Summary
Optimization of performance is an ongoing process that requires us to be conscious of every aspect of development. The above five techniques are the most commonly used and effective methods of forward-end development。
Remember, optimization presupposes measurement. Using tools such as chrome devtools and lighthouse, analytical bottlenecks and targeted optimization can be more effective。
I hope these techniques help you. What are the performance optimization methods you used in the project? You are welcome to share your experience in the comment area。
# front-end development # performance optimization # javasCript #web development #processor
