jquery checkbox repeated calls to attr (' checked ', true/false) only take effect for the first time

/* *   * Select All * *    function  checkall () {       $ (true);   }      /** *   all not   selected *    /function  uncheckall () {       $ (false);   

Problem Description:

The initial status check box does not have a full selection,

Click the Select All button to call the Checkall method,

A full selection is achieved,

Then click the Uncheck All button,

To achieve a complete no-election,

Then click the Select All button again,

The result is a full selection of wood,

Then repeatedly click on the wood to have any reaction.

Workaround:

The use of the prop method instead of the attr method is solved.

/* *  *  Select All * *   function  checkall () {      $ (true);  }

Reference Address: http://blog.csdn.net/tunzao/article/details/17225173

jquery checkbox repeated calls to attr (' checked ', true/false) only take effect for the first time