Method 1: for loop
Method 2: for loop condition, writing (function method)
The condition is being written, the effect without a break is as follows, the smallest is first, so it is necessary to add a break to terminate
Method 3: for loop condition, write backwards (function method)
Invert the output effect, assuming min = 10, max = 15, the least common multiple is at the end, the value is 30, so you need to declare a min = 0, then reassign, and finally output 30
