//$('#search')表单input;$('.search_out')浮动元素

var u = navigator.userAgent, app = navigator.appVersion;
var isiOS = !!u.match(/\(i[^;]+;( U;)? CPU.+Mac OS X/);
if (isiOS) {
$('#search').focus(function (e) {
if(!window.res) {
setTimeout(function(){var height = $(window).scrollTop();
$('.search_out').css({position:"absolute",top: -height+"px"})},10)
}
});
$('#search').blur(function () {
if(!window.res) {
$('.search_out').css({position:"fixed",top:"0px"});
}
});
};