调整multiselect宽度

$('#example-enableCollapsibleOptGroups-collapsed').multiselect({
buttonWidth: '400px',
enableClickableOptGroups: true,
enableCollapsibleOptGroups: true,
buttonContainer: '<div id="example-enableCollapsibleOptGroups-collapsed-container" />',

});
$('.dropdown-menu').css('width', '400px');

$('#example-enableCollapsibleOptGroups-collapsed-container .caret').click();
$('#example-enableCollapsibleOptGroups-collapsed-container').click();