JavaScript loops scattered knowledge points __java

For...in
foreach ()
Infinity Infinite Big alert (1/0);
-infinity Infinite Small alert ( -1/0);

Break (interrupted):
1, the application in the switch statement, as long as the Break,switch statement end.
2, the application in the cycle, the end of this layer cycle, continue the next layer of circulation. As long as the break to jump out of this cycle, the other statements in this cycle will not be executed

Continue
Use in a loop, end this cycle, and go to the next loop

Loop nesting (two layers):
For the while do.. While

for () {

for () {



}

}

Execution process
The outer loop executes once, and the inner loop finishes
Print graphics are:
The outer loop controls the row, and the inner loop controls the column
Formula: Number of First planet number + (i-1) * (difference of adjacent two planets)
7+ (i-1) * ( -2) =7-2*i+2=9-2*i