点击除了弹窗内容区域，弹窗消失

jQuery.fn.isChildAndSelfOf = function(b){ return (this.closest(b).length > 0); }; 
                $('.modal_container').click(function(event){ 
                    var moadalFlag = $(event.target).isChildAndSelfOf(".modal_inner");
                    if(!moadalFlag){
                        $('.modal_container').hide();
                    }
                });