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 8409b40cd2abca0c7044010d13b835db must be within 221f08282418e2996498697df914ce4e18bb6ffaf0152bbe49cd8a3620346341.

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