How to solve the problem that the jquery element cannot be found

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Jquery element can not find the solution: 1, view the corresponding code file; 2, check the error through debug; 3, remove the point in id.

This article operating environment: windows7 system, jquery3.2.1 version, DELL G3 computer

What if the jquery element cannot be found?

Jquery cannot get the specified element using $

The specific code is as follows:

Var id='#'+screen.timeleftvar timeCountDown = $(id)

Then the timeCountDown is always empty, and the debug discovers:

The reason is that id contains "." After removing it, the element is found.

Var id='#'+screen.timeleft.replace (/\. / g, ") .replace (/\: / g,") .replace (/\-/ g, ") var timeCountDown = $(id)

And then it's normal.

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