                        课程
                    
                        /前端开发
                        
                            /jQuery
                        
                        /jQuery基础(五)一Ajax应用与常用插件

if 后面不是跟判断语句吗

jQuery基础(五)中,下面这句代码该如何理解

if($.cookie('email')){
                    $('#email').val($.cookie('email'));
                    }

有点蒙

整段代码如下:

        <script type="text/javascript">
            $(function () {
                if($.cookie('email')){
                    $('#email').val($.cookie('email'));
                }
                $("#btnSet").bind("click", function () {
                    if ($("#chksave").is(":checked")) {
                        $.cookie('email',$('#email').val(), {
                            path: "/", expires: 7
                        })
                    }
                    else {
                          $.cookie('email',null, {
                            path: "/"
                        })
                    }
                });
            });
        </script>