yundewu-website/page_about_us/jssrc/index.js

$(function(){
    $.fn.extend({
        //顶部浮动
        topNavPosition : function(){
            var _this = this;
            var _father = _this.parent();
            var _last = _this.find(".header-last-box");
            var _animate = true;
            $(window).scroll( function(){
                if($(window).scrollTop()>35 && _animate == true){
                    _father.animate({
                        height:"60px"
                    });
                    _this.css({
                        "box-shadow":"1px 1px 30px #999"
                    })
                    _this.animate({
                        top:"-35px"
                    });
                    _last.animate({
                        height:"60px"
                    });
                    _animate = false;
                }
                if($(window).scrollTop() == 0){
                    _father.animate({
                        height:"115px"
                    });
                    _this.css({
                        "box-shadow":"0px 0px 0px #999"
                    })
                    _this.animate({
                        top:"0"
                    },300);
                    _last.animate({
                        height:"80px"
                    });
                    _animate = true;
                }
            } )
        },
        //顶部下拉菜单
        topDropDownMwnu:function(){
            $(this).hover(function(){
                var _thisID = $(this).attr('id');
                $('.drop-down-menu').css({
                    display:'block'
                });
                $('.'+_thisID).css({
                    display:'block'
                }).siblings().css({
                    display:'none'
                })
            },function(){
                $('.drop-down-menu').css({
                    display:'none'
                });
            });
            $('.drop-down-menu').hover(function(){
                $('.drop-down-menu').css({
                    display:'block'
                })
            },function(){
                $('.drop-down-menu').css({
                    display:'none'
                })
            });

        }
    });

    function pageFun(){
        $('.header-nav-content-box').topNavPosition();
        $('.drop-down-but').topDropDownMwnu();
    }
    pageFun();
})