With regard to the bidirectional binding of img tags to Vue v-bind, a sharp decline in performance will occur when the number of json is large. V-once has no effect.

problem description

Vue developed a picture website, and the online address bz.zzzmh.cn
found a performance problem after development
. To put it simply, the url of
images exists in a json array
binds to img"s src with v-bind
and then just add or change any piece of data in the json array
will trigger vue"s two-way binding. Causes all pictures on the entire page to refresh
very stuttered
calculation does not change json
pictures to a certain number and is also very stuck

the environmental background of the problems and what methods you have tried

because I am a rookie at the front end.
after searching for a long time, only v-once will refresh all img tags when json is changed.

what result do you expect? What is the error message actually seen?

I just don"t understand one thing right now.
there is a way for vue to render only once. I used it incorrectly. Can I optimize it?
or the data structure I designed in the first place is wrong. Should it be rendered in another way?
for example,
is placed in a json in the first place without changing the json?
or do you render this large amount of data with native json?

add the picture I just tested

I just found that chrome has this function in Baidu how to test the performance of the front-end page. I"m still learning how to use
to attach a screenshot. I don"t know if I can see the problem
Performance

.
Vue.js
Jul.07,2022

depends on how your changes are written. If your array is push, it won't lead to a full refresh.

experienced your website, I'll give you some ideas:
1, lazy loading (the first screen only shows so many pictures, the first screen loads well in advance-later drop-down or other triggers to load again)
2, batch preload (now there is real-time to% loding, but too slow. The practice of Baidu pictures is to load a batch of pictures in advance)
3. Preloading only loads low-definition resources, except for case

which must be loaded in high definition. I'm sorry I didn't know Baidu before I asked. Now know that you can use performance analysis to know how to find problems.
it turns out that I abused vue's computed
such as picture information and whether pictures are collected
. I used computed to judge
results found that every time stutter seems to cycle the whole page in the dynamic judgment
is actually a lot of repetition
I still have to first re-study the principle of vue's computed.
was written with the attitude of realizing the function before, without in-depth study

.

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