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13 JavaScript one-line programs that make you look like an expert
2021-08-23 10:31:18 【.Der_ Rabe】
JavaScript Can do a lot of fun , From complex frameworks to processing API, There's so much to learn . however , It also allows us to do great things in one line .
1. Get a random Boolean value (true
/false
)
This function uses Math.random()
Method returns a Boolean value (true
perhaps false
).Math.random
Create a 0
To 1
Random number between , We just need to check if it's above or below 0.5
, There is 50% Opportunity to get true
or false
.
2. Check that the date provided is a working day
Using this method , We can check whether the date provided in the function is a weekday or weekend day .
3. Reverse string
There are several different ways to reverse a string . This is the simplest one , Use split()
、reverse()
and join()
Method .
4. Check whether the current tag is hidden
Document.hidden
( Read-only property ) Returns a Boolean value , Indicates that the page is (true
) no (false
) hide .
Outside : Inadvertently found that iqiyi's advertisement playing time actually counts down when the current tab is activated , When leaving the current tab , The countdown stops , Baidu found document.hidden
This east east .
document.hidden
yes h5
New addition api
There is a compatibility problem when using .
5. Check whether a number is even or odd
6. Get the time from a date
7. Retain n Decimal place
8. Check if any element is currently in focus
We can use document.activeElement
Property to check whether an element is currently in focus .
9. Check whether the current browser supports touch events
10. Check whether the current browser is on the Apple device
11. Scroll to the top of the page
12. Get the average value of the parameter
13. Fahrenheit / Celsius conversion
~ End , I'm a dishwasher , Club massage walk up
author : The front end little wisdom
link :https://juejin.cn/post/6997930259953745950
source : Nuggets
The copyright belongs to the author . Commercial reprint please contact the author for authorization , Non-commercial reprint please indicate the source .
copyright notice
author[.Der_ Rabe],Please bring the original link to reprint, thank you.
https://en.qdmana.com/2021/08/20210823103114516u.html
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