JQuery removes spaces at the beginning and end of a string.

Removes spaces at the beginning and end of a string. JQuery code: $. trim (& quot; hello, howareyou? & Quot;); the Code for copying the checkbox value read cyclically by jquery is as follows: $ (& quot; input [typecheckbox] [checked] & quot ;). each (function () {// the check box is generally selected. removes spaces at the beginning and end of a string. JQuery code: $. trim ("hello, how are you? "); Jquery cyclically reads the checkbox value and copies the Code as follows: $ (" input [type = checkbox] [checked] "). each (function () {// Since multiple check boxes are selected, You can output alert ($ (this) cyclically ). 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 () $ ("# "). all text () values are values. Take html and use text. Method 1: Fill ('your id'}.css ('display', 'None'); fill ('your id'}.css ('display', 'block'); Method 2: $ ('# id '). hide (); $ ('# id '). show (); radio button group, name = "sex ". Male Female Unknown1. obtain the value selected by radio. $ ('input: radio [name = sex]: checked '). val (); 2. select the radio button (Male ). $ ('input: radio [name = sex]: nth (0 )'). attr ('checked', true); or $ ('input: radio [name = sex] ') [0]. checked = true; 3. select the radio button (Female ). $ ('input: radio [name = sex]: nth (1 )'). attr ('checked', true); or $ ('input: radio [name = sex] ') [1]. checked = true; 4. select the radio button (Unknown ). $ ('input: radio [name = sex]: nth (2 )'). attr ('checked', true); or $ ('input: radio [name = sex] ') [2]. checked = true; 5. reset the radio button. $ ('input: radio [name = sex] '). attr ('checked', false );