jQuery: Difference analysis of whether there is a space before nth-child_jquery

Then, I wrote the following html:

12




                                                                        td>31


The expected effect is:




So I wrote the following jQ:

$(".a:nth-child(2)").css("color","red");

The result of running the operation is actually:

I am puzzled. . Finally, I found that JQ was rewritten as:

$(".a :nth-child(2)").css("color","red");

That’s it.

Note: There is a space after a! ! !

Although the problem has been solved, I don’t know the cause. Please give me some guidance. . .

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