Introduction to using jquery $.trim of method

$. Trim (STR)

Return: string;

Remove Spaces at the beginning and end of a string.

Example:

Here's the error code:

 
<input type="text" name="" id="results" value=""/> 

var content = $('#content').val(); 
if(content.trim() == '') 
alert(' empty '); 

The above method does not report errors in firefox, but it does report errors in ie

Therefore, the following format should be written:

 
<input type="text" name="" id="results" value=""/> 

var content = $('#results').val(); 
if($.trim(content) == '') 
alert(' empty '); 

or

 
var content = $('#content').val(); 
if(jQuery.trim(content) == '') 
alert(' empty ');