Does continue jump out of the current loop or all loops?

continue is to jump out of the current loop. The continue statement is used to skip this loop and execute the next loop; when encountering the continue statement, the program will immediately recheck the conditional expression. If the expression result is true, the next loop will start. If the expression result is false, Exit the loop.

The operating environment of this tutorial: windows7 system, javascript version 1.8.5, Dell G3 computer.

continue statement

The continue statement is used to skip this loop and execute the next loop. When encountering a continue statement, the program will immediately re-test the conditional expression. If the expression result is true, the next loop will start. If the expression result is false, the loop will exit.

[Example 1] Use the continue statement to jump out of the for loop:

<script type="text/javascript">
for (var i = 1; i < 10; i++) {
    if(i % 2 != 0) {
       continue;
    }
    console.log(i);
}
</script>

Analysis:

• for (var i = 0; i &lt ; 10; i ){}The statement can be used to loop through all numbers between 1 and 10

• if(i % 2 != 0) The statement is used to determine whether the value of i is divisible by 2. If it cannot be divisible, if the value in () is true, the continue; statement will be executed.

• In the loop body, use the if(i % 2 == 0) statement to determine if the value of i can be divided by 2 Just use "console.log(i);" to output; if the value of i cannot be divided evenly by 2, the continue; statement will be triggered to jump out of this loop ( No output), execute the next cycle.

Output result:

Extended knowledge: break statement

The break statement is used to jump out of the current syntax structure. It can terminate the code of the loop body and jump out of the current loop immediately, executing the code after the loop (if any).

The difference between break and continue is that the continue statement only ends the current loop, while the break statement terminates the execution of the entire loop.

Use the code in Example 1 above and replace continue; with break;. What will be output?

<script type="text/javascript">
for (var i = 1; i < 10; i++) {
    if(i % 2 != 0) {
       break;
    }
    console.log(i);
}
</script>

The answer is: Nothing is output. Why is this happening? Let’s analyze it:

At the beginning of the forx loop, i=1, is 1 less than 10? Of course, then start executing the if(i % 2 != 0) statement in the loop body;

So can 1 be divided by 2? Obviously it cannot, so if the value in () is true, then the "break;" statement in the if is executed, jumping out of the entire loop directly, and there is no chance to execute "console .log(i);" statement.

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