What should I do if the jquery element cannot be found?

The jquery element cannot be found solution: 1. Check the corresponding code file; 2. Check the error through debug; 3. Just remove the dot in the id.

The operating environment of this article: windows7 system, jquery version 3.2.1, DELL G3 computer

What should I do if the jquery element cannot be found?

jquery cannot get the specified element using $

The specific code is as follows:

var id='#'+screen.timeleft
var timeCountDown = $(id);

Then timeCountDown has always been empty. After debugging, I found:

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

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

and then everything is normal.

Recommended learning: "jquery video tutorial"

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