Detailed explanation of usage techniques of javascript operators || and &&

js The AND-OR operator || && is wonderfully useful and can be used to streamline code and reduce the readability of the program.

Requirement 1.

Assume that the growth speed display regulations are as follows:
When the growth speed is 5, 1 arrow is displayed;
When the growth speed is 10, 2 arrows are displayed;
A growth rate of 12 displays 3 arrows;
A growth rate of 15 displays 4 arrows;
Others display 0 arrows.
How to implement it with code?

Requirement 2.

Assume that the growth speed display regulations are as follows:

##The growth speed is >12 and 4 are displayed Arrows;

When the growth rate is >10, 3 arrows are displayed;

When the growth rate is >5, 2 arrows are displayed;

The growth rate is >0 and 1 arrow is displayed;

The growth rate is <=0 and 0 arrows are displayed.

Then it is very troublesome to implement it with switch.

So have you ever thought about implementing it in one line of code?
ok, let’s take a look at the powerful expressiveness of js:

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This code is used by the author to process $(html), some tags must be constrained, such as < ;option> must be within .

Maybe you also discovered that another very clever thing about the author is !tags.indexOf("

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