点击空白处隐藏

$(document).on("click", ".input-open", function (e) {    var e = e || window.event;    e.stopImmediatePropagation();    $(".answer-input").slideUp();    var tag = $(this).parents(".answer-content").next();//要被隐藏的元素    tag.slideUp();    if (tag.is(":hidden")) tag.slideDown();    var flag = true;    $(document).on("click", function (e) {        var target = $(e.target);        if (target.closest(tag).length == 0 && flag == true) {            $(tag).slideUp();            flag = false;        }    })})