jQuery removes spaces at the beginning and end of a string (implemented in multiple ways)_jquery

Remove spaces from the beginning and end of the string.
jQuery code:

Copy code The code is as follows:

$.trim(" hello , how are you? ");

jquery loop to read checkbox value
Copy code The code is as follows:

Copy code The code is as follows:

$("input[type=checkbox][checked]").each(function(){ //Since the checkbox is generally selected Multiple, so you can loop and output
alert($(this).val());
});

$("#A").val("1" ) The value of id A is 1. This is the case in jQuery. When assigning, it is passed to the function as a parameter, which is different from simple js.
Like $("#A").html("1")$( "#A").text("1") is all about assignment $("#A").html() $("#A").text() is all about taking value, taking html,
taking text Text
Method 1:

Copy code The code is as follows:

$('#id ').css('display','none');
$('#id').css('display','block');

Method 2:

Copy code The code is as follows:

$('#id').hide();
$('#id').show();

radio button group, name="sex".

Copy code The code is as follows:

Male
< input type="radio" name="sex" value="Female">Female
Unknown

1. Get the value selected by the radio.

Copy code The code is as follows:

$('input:radio[name=sex]:checked').val();

2. Select the radio button (Male).

Copy code The code is as follows:

$('input:radio[name=sex]:nth(0)') .attr('checked',true);

or

Copy code The code is as follows:

$('input:radio[name=sex]')[0].checked = true;

3. Select the radio button (Female).

Copy code The code is as follows:

$('input:radio[name=sex]:nth(1 )').attr('checked',true);
or
$('input:radio[name=sex]')[1].checked = true;

4. Select the radio button (Unknown).

Copy code The code is as follows:

$(' input:radio[name=sex]:nth(2)').attr('checked',true);
or
$('input:radio[name=sex]')[2].checked = true;

5. Reset radio button.

Copy code The code is as follows:

$('input:radio[name=sex]').attr('checked',false);