为什么此脚本永远不会运行？

Question

I've got the following JavaScript statement, that executes on Page Load:

The variable u1 is populated with one of the following values:

BBSLoan|Accept|PPI+No|60Months
BBSLoan|Refer|PPI+No|60Months
HSBSLoan|Accept|PPI+No|48Months
HSBSLoan|Refer|PPI+No|48Months

I have been informed that the conditions in the conditional statements will never be met - is this true? From what I can see, going on each of the variables, the index that will be returned by indexOf is 0 ? Unless I am mistaken?

EDIT: Just to clarify, the variable 'u1' will be populated dynamically with any of the 4 strings listed above. The %pu1=!; is actually a macro that will populate this value.

<script language="JavaScript" type="text/javascript">
    var u1 = '%pu1=!;';

    if (u1.indexOf('BBSLoan|Accept') > -1) {
        var pvnPixel = '<img src="http://www.url1.com"/>';
        document.writeln(pvnPixel);
    }
    if (u1.indexOf('BBSLoan|Refer') > -1) {
        var pvnPixel2 = '<img src="https://www.url2.com;"/>';
        document.writeln(pvnPixel2);
    }
    if (u1.indexOf('HSBSLoan|Accept') > -1) {
        var pvnPixel3 = '<img src="https://www.url3.com;"/>';
        document.writeln(pvnPixel3);
    }
</script>

Thanks in advance!

Answer 1

EDIT: Just to clarify, the variable 'u1' will be populated dynamically with any of the 4 strings listed above. The %pu1=!; is actually a macro that will populate this value.

This answer is not correct. It will be deleted later, but is being left to prevent this answer from popping up again.

var u1 = '%pu1=!;';

The value of u1 is always '%pu1=!;' , since you declare it as that.

Answer 2

好的，我终于使用search而不是indexOf ！

Answer 3

Would it make more sense to use a switch statement with a default case, or at a minimum provide an "else" with a default?

Have you tried to put a debugger statement in after var u1 is set, and step through using the client (firefox, chrome, IE, safari all have built in "developer tools" with the ability to step through js code) debugger to see what the value of u1 is?