详细说明：
jquery复选框多选框源码下载jquery复选框多选框源码下载jquery复选框多选框源码下载jquery复选框多选框源码下载jquery复选框多选框源码下载 jQuery MultiSelect Widget Demo Basic Demos
Both multiselects are created with the following one-liner. Optgroup support is built in out of the box:
$(function(){ $("select").multiselect(); }); Basic
With Optgroups
Click on an optgroup's heading to toggle the checked state of the entire group.
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