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$(document).ready(function () {
$(".signin").click(function () {
var winWidth = 0;
if (window.innerWidth)
winWidth = window.innerWidth;
else if ((document.body) && (document.body.clientWidth))
winWidth = document.body.clientWidth;
// 通过深入Document内部对body进行检测,获取窗口大小
if (document.documentElement && document.documentElement.clientHeight && document.documentElement.clientWidth) {
winWidth = document.documentElement.clientWidth;
}
$("fieldset#signin_menu").toggle();
$(".signin").toggleClass("menu-open");