jquery listnav插件在ios上面点击两次才能执行

function bindhandlers() {				if (opts.showcounts) { $wrapper.mouseover(function() { setlettercounttop(); }); }				if (opts.showcounts) { $('a', $letters).mouseover(function() { var left = $(this).position().left; var width = ($(this).outerwidth({ margin: true }) - 1) + 'px'; var count = getlettercount(this); $lettercount.css({ left: left, width: width }).text(count).show(); }); $('a', $letters).mouseout(function() { $lettercount.hide(); }); }				$('a', $letters).click(function() {					$('a.ln-selected', $letters).removeclass('ln-selected'); var letter = $(this).attr('class').split(' ')[0]; if (letter == 'all') { $list.children().show(); $list.children('.ln-no-match').hide(); isall = true; } else {						if (isall) { $list.children().hide(); isall = false; } else if (prevletter != '') $list.children('.ln-' + prevletter).hide(); var count = getlettercount(this); if (count > 0) { $list.children('.ln-no-match').hide(); $list.children('.ln-' + letter).show(); }						else $list.children('.ln-no-match').show(); prevletter = letter;					}					if ($.cookie && (opts.cookiename != null)) $.cookie(opts.cookiename, letter); $(this).addclass('ln-selected'); $(this).blur(); if (!firstclick && (opts.onclick != null)) opts.onclick(letter); else firstclick = false; return false;				});			}