Jquery page operation
. $ ( '# D1') html ( "<p> toast to invite the moon </ p>"); // set d1 into the internal html $ ( '# d1') html ();. // Get the inside d1 html $ ( '# d1') append ( "this is additional content"); // appended to the content d1 $ ( '# d1') after ( "add back"); // add content later d1 $ ( '# d1') before ( "added before"); // add content in front d1