Javascript-如果条件循环指向数组，则在其中跳过循环代码

Question

In example 1, running that results in line 4 being executed and then skipping right over line 5. In example 2, changing line 4 to refer to the actual value rather than an array allows line 5 to be executed.

What can I do to make example 1 work properly? And why does example 2 work and not example 1?

I've used the same for loop in another instance, with a different array, that worked perfectly. So perhaps it's the array itself that's the problem?

1.

var temp2 = rightbarcoderead(i);

        for (i = 0; i < 10; i++) {
            if (temp2 === righteven[i]) {
                rightbarcode += i
            }

2.

var temp2 = "100110";

        for (i = 0; i < 10; i++) {
            if (temp2 === righteven[i]) {
                rightbarcode += i
            }

Answer 1

From the information provided the only thing we know for sure is that in example 1 temp2 is not set with the expected value 100110 .

This may be due to i being undefined when you call

var temp2 = rightbarcoderead(i);

or i set with the wrong value or, again, rightbarcoderead() function not returning the expected result with the given i parameter.