Javascript-php page Jump

In this way, you can jump to {code...} and the following code server returns a blank page without executing my command. What is the problem? Php code: {code...} can jump to the URL as follows:

echo "《script》";echo "window.location.href = '$url'";echo "《script》";

The following code server returns a blank page without executing my command. What is the problem? Php code:

echo "《script》";echo "function(){   alert($error_msg);   setTimeout(window.location.href = '$url',5);}";                    echo "《script》";    

Reply content:

In this way, you can jump normally:

echo "《script》";echo "window.location.href = '$url'";echo "《script》";

The following code server returns a blank page without executing my command. What is the problem? Php code:

echo "《script》";echo "function(){   alert($error_msg);   setTimeout(window.location.href = '$url',5);}";                    echo "《script》";    

SetTimeout (func, 5 );
Func is a method.

echo "《script》";echo "function func(){   alert($error_msg);   window.location.href = '$url';}";setTimeout(func,5);                    echo "《script》";

Upstairs

The js part only defines that the function is not called.