jquery - 不是函数错误

这是我的代码：

(function($){
    $.fn.pluginbutton = function (options) {
        myoptions = $.extend({ left: true });
        return this.each(function () {
            var focus = false;
            if (focus === false) {
                this.hover(function () {
                    this.animate({ backgroundPosition: "0 -30px" }, { duration: 0 });
                    this.removeClass('VBfocus').addClass('VBHover');
                }, function () {
                    this.animate({ backgroundPosition: "0 0" }, { duration: 0 });
                    this.removeClass('VBfocus').removeClass('VBHover');
                });
            }
            this.mousedown(function () {
                focus = true
                this.animate({ backgroundPosition: "0 30px" }, { duration: 0 });
                this.addClass('VBfocus').removeClass('VBHover');
            }, function () {
                focus = false;
                this.animate({ backgroundPosition: "0 0" }, { duration: 0 });
                this.removeClass('VBfocus').addClass('VBHover');
            });
        });
    }
});


$(document).ready(function () {
    $('.smallTabsHeader a').pluginbutton();
});

它给了我一个错误。怎么了？

这个问题“最好”通过使用来解决匿名函数 https://en.wikibooks.org/wiki/JavaScript/Anonymous_functions这样传入 jQuery 对象：

匿名函数如下所示：

<script type="text/javascript">
    (function($) {
        // You pass-in jQuery and then alias it with the $-sign
        // So your internal code doesn't change
    })(jQuery);
</script>

这是 JavaScript 与“模块模式”之类的东西一起使用时实现（穷人的）“依赖注入”的方法。

所以你的代码看起来像：
当然，您现在可能想对内部代码进行一些更改，但您已经明白了。

<script type="text/javascript">
    (function($) {
        $.fn.pluginbutton = function(options) {
            myoptions = $.extend({ left: true });
            return this.each(function() {
                var focus = false;
                if (focus === false) {
                    this.hover(function() {
                        this.animate({ backgroundPosition: "0 -30px" }, { duration: 0 });
                        this.removeClass('VBfocus').addClass('VBHover');
                    }, function() {
                        this.animate({ backgroundPosition: "0 0" }, { duration: 0 });
                        this.removeClass('VBfocus').removeClass('VBHover');
                    });
                }
                this.mousedown(function() {
                    focus = true
                    this.animate({ backgroundPosition: "0 30px" }, { duration: 0 });
                    this.addClass('VBfocus').removeClass('VBHover');
                }, function() {
                    focus = false;
                    this.animate({ backgroundPosition: "0 0" }, { duration: 0 });
                    this.removeClass('VBfocus').addClass('VBHover');
                });
            });
        }
    })(jQuery);
</script>