JQuery removes spaces between the start and end of a string (implemented in multiple methods) _ jquery

Remove spaces at the beginning and end of a string. This document describes how to remove spaces in multiple ways, for more information, see remove spaces at the beginning and end of a string.
JQuery code:

The Code is as follows:

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

Jquery cyclically reads the checkbox Value
The Code is as follows:

The Code is as follows:

$ ("Input [type = checkbox] [checked]"). each (function () {// Since multiple check boxes are selected, You can output them cyclically.
Alert ($ (this). val ());
});

$ ("# "). The value of val ("1") id as A is 1 in jQuery. When assigning values, it is passed as A parameter to the function, which is different from js alone,
Like $ ("# A" ).html ("1") $ ("# "). all text ("1") values are assigned $ ("# A" ).html () $ ("# "). both text () and text () are values. The values are html,
Retrieve text
Method 1:

The Code is as follows:

Watermarks ('regionid').css ('display', 'None ');
Watermarks ('regionid').css ('display', 'block ');

Method 2:

The Code is as follows:

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

Radio button group, name = "sex ".

The Code is as follows:

Male
Female
Unknown

1. Obtain the value selected by radio.

The Code is as follows:

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

2. Select the radio button (Male ).

The Code is as follows:

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

Or

The Code is as follows:

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

3. Select the radio button (Female ).

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 ).

The Code is as follows:

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

5. Reset the radio button.

The Code is as follows:

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