Excuse me, let's ask a simple question.

Excuse me, just ask a simple question // varis_fans = & lt ;? Phpecho $ guanzhu ;? & Gt; this is a sentence written in JS. The PHP variable already exists. if I assign a value like this, the JS variable is_fans cannot be used in some browsers .. have you ever encountered such a situation ?, Check the error message on the console and ask a simple question.
// Var is_fans = ;

This is a sentence written in JS. PHP variables already exist. if I assign a value like this, the JS variable is_fans cannot be used in some browsers ..

Have you ever encountered such a situation?

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Check the error message in the console.
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Var is_fans =' ';

Try it with single quotes
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This should not happen. the output from the server is irrelevant to the browser. Check other code.
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It depends on what is in $ guanzhu.
I cannot guess it.