javascript - chrome抛出Uncaught RangeError：超过最大调用堆栈大小

Question

我正在尝试使用引导弹出窗口构建一个简单的小部件

UW.UI.ProjectMember = {

dropdown: ".project-member-select-dropdown",
input: ".member-search-field",

options: {
    container: $('.project-member-select'),
    trigger: "click",
    minChar: 2
},

renderTemplate: function() {
    var template = '<div class="project-member-picker">'+
                        '<div class="project-member-search-box">'+
                            '<input type="text" class="member-search-field input-block-level" placeholder="Enter a name">'+
                            '<ul class="project-member-select-dropdown"></ul>'+
                        '</div>'+
                        '<div><p>You can invite your colleagues to use UberWork with you</p></div>'+
                    '</div>';

    this.options.container.append(template);

    return this;
},

initPopover: function() {
    var _this = this;

    $(".add-member-btn").popover({
        html: true,
        placement: "bottom",
        trigger: _this.options.trigger,
        container: '#window',
        content: _this.build()
    });
},

build: function() {

    return $('.project-member-picker').html();
},

delegateEvents: function() {
    var _this = this;

    $(document).on("keydown",'.popover .member-search-field', function(event) {
        _this.processInput(event, _this);
    });

    $(document).on("click", '.popover li.member', function(event) {
        _this.addToken(event, _this);
    });

    $(document).on("click", '.popover .project-members ul li a.remove', function(event) {
        _this.deleteToken(event, _this);
    });
},

showDropdown: function() {
    $(this.dropdown).css({
                position: "absolute",
                zindex: 999
            }).show();
},  

hideDropdown: function() {
    $(this.dropdown).hide().empty();
},

processInput: function(event, that) {
    var input = $(event.currentTarget),
    inputValue = input.val(), timeout;

    if(inputValue.length >= 1) {
        that.showSearchActivity();

        clearTimeout(timeout);
        timeout = setTimeout(function() {
            that.runSearch(inputValue.toLowerCase())
        }, 300);
    }
    else {
        that.hideDropdown();
    }
},

showSearchActivity: function() {
    $(this.dropdown).html('<p>Searching...</p>');
    this.showDropdown();
},

runSearch: function(query) {
    var results = $.grep(UW.Members, function (row) {
        return[row.name].toString().toLowerCase().indexOf(query.toLowerCase()) > -1;
    });

    this.populateDropdown(query, results);
},

populateDropdown: function(query, results) {
    var _this = this;

    if(results && results.length) {
        $(this.dropdown).empty();
        this.hideDropdown();

        $.each(results, function (index, value) {
            if(value.photo == "")
                var photo = UW.Constants.avatar;
            else
                var photo = value.photo;

            var template = '<li class="member" data-id="'+value.user_id+'">'+
                                '<div class="member-avatar pull-left"><img src="'+photo+'"></div>'+
                                '<div class="member-name pull-left">'+value.name+'</div>'+
                            '</li>';

            $(_this.dropdown).append(template);
        });

        this.showDropdown();
    }else {
        $(this.dropdown).html('<p>No results</p>');
        this.showDropdown();
    }
},

addToken: function(event, that) {

    var el = $(event.currentTarget);
    var id = el.attr('data-id');

    var user = {
        name: $(el).find('div.member-name').html(),
        photo: $(el).find('div.member-avatar').find('img').attr('src')
    };

    //update member list
    var members = this.options.container.find('div.project-members ul.member-avatars');


        if(members.find('li[data-id="'+id+'"]').length == 0) {

            members.append('<li data-id="'+id+'"><img src="'+user.photo+'" title="'+user.name+'"></li>');
        }

    //clear input
    $(that.input).val('');

    //Hide dropdown
    this.hideDropdown();
},

deleteToken: function(event, that) {

    event.preventDefault();
},

init: function() {
    this.renderTemplate();
    this.initPopover()
    this.delegateEvents();
}

我知道要发布很多代码，无论如何我正在UW.UI.ProjectMember从主干视图实例化该类。当$(".add-member-btn")单击元素触发弹出框时，第一次一切正常，但是当再次单击元素以隐藏弹出框时，chrome 控制台显示此错误“未捕获 RangeError：超出最大调用堆栈大小”。我可能做错了什么？任何帮助将不胜感激。