Backend verification cannot be omitted at any time! ! In addition to what @JellyBool said above, the more important thing is that the request is not necessarily initiated from the browser, but may also be manually constructed by others (perhaps for bad purposes). If some important fields Without verification on the server side, it may become a vulnerability that can be exploited. So never rely entirely on client-side verification, you should only use client-side verification as an auxiliary means.
Personally, I think it is still necessary. The simplest scenario is: if the user is using a lower version of the browser, such as IE8, can you ensure that the required feature of HTML 5 can take effect?
The first floor is right, both the front-end and the back-end must have verification, because browsers below ie8 do not support html5. Moreover, front-end data is sometimes unreliable. Front-end verification is only an auxiliary means that can help relieve back-end pressure and provide a better user experience. Never rely solely on the front end to process data at any time.
If you use node as the backend, there is basically no increase in workload. The verification libraries and statements are common to both the front and back ends. You can copy them directly from the front end to the back end and just change a little bit.
![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
Backend verification cannot be omitted at any time! !
In addition to what @JellyBool said above, the more important thing is that the request is not necessarily initiated from the browser, but may also be manually constructed by others (perhaps for bad purposes). If some important fields Without verification on the server side, it may become a vulnerability that can be exploited.
So never rely entirely on client-side verification, you should only use client-side verification as an auxiliary means.
Never trust front-end data.
Never trust front-end data.
Never trust front-end data.
Personally, I think it is still necessary. The simplest scenario is: if the user is using a lower version of the browser, such as IE8, can you ensure that the required feature of HTML 5 can take effect?
Can installing a metal detector at the gate prevent gangsters?
Wrong
Thugs can also climb in through the window
So, please add verification on the backend
The answer on the first floor is correct, the backend is the final guarantee
Both the front and back ends must be verified
dont believe anything
The first floor is right, both the front-end and the back-end must have verification, because browsers below ie8 do not support html5. Moreover, front-end data is sometimes unreliable. Front-end verification is only an auxiliary means that can help relieve back-end pressure and provide a better user experience. Never rely solely on the front end to process data at any time.
If you use node as the backend, there is basically no increase in workload. The verification libraries and statements are common to both the front and back ends. You can copy them directly from the front end to the back end and just change a little bit.
Don’t trust any data from the front end