前端开发学习笔记二

 1 shop.app.Banner=function(){            //Banner轮播图效果
 2     var ad=document.getElementById("ad");
 3     var ul=ad.getElementsByTagName("ul")[0];
 4     var li=ul.getElementsByTagName("li");
 5 
 6     var iNow=0;
 7     var timer=setInterval(auto,3000);
 8 
 9     function auto()       //自动切换效果
10     {
11         if(iNow==li.length-1)
12         {
13             iNow=0;
14         }
15         else{
16             iNow++;
17         }
18         for(var i=0;i<li.length;i++)
19         {
20             shop.ui.fadeOut(li[i]);
21         }
22         shop.ui.fadeIn(li[iNow]);
23     }
24 };

window.onload=function(){        //调用函数
    shop.app.Banner();
    shop.app.search();
    shop.app.sort();
    shop.app.Run();
};
var shop={};        //命名空间
shop.tools={};
shop.tools.getByClass=function(Par,Cla)        //获取对应class的对象
{
    var allEle=Par.getElementsByTagName("*");
    var arr=[];
    for(i=0;i<allEle.length;i++)
    {
        if(allEle[i].className==Cla)
        {
            arr.push(allEle[i]);
        }
    }
    return arr;
};
shop.tools.getStyle=function(obj,attr)        //获取对象属性
{
    if(obj.currentStyle)
    {
        return obj.currentStyle[attr];
    }
    else
    {
        return getComputedStyle(obj,false)[attr];
    }
};

shop.ui={};
shop.ui.fadeIn=function(obj)        //淡入效果
{
    var attr=shop.tools.getStyle(obj,‘opacity‘);
    if(attr==1)
    {
        return false;
    };
    var value=0;
    clearInterval(obj.timer);
    obj.timer=setInterval(function(){
        var speed=5;
        if(value==100){
            clearInterval(obj.timer);
        }
        else
        {
            value+=speed;
            obj.style.opacity=value/100;
        }
    },30);
};
shop.ui.fadeOut=function(obj)        //淡出效果
{
    var attr=shop.tools.getStyle(obj,‘opacity‘);
    if(attr==0)
    {
        return false;
    };
    var value=100;
    obj.timer=setInterval(function(){
        var speed=-5;
        if(value==0)
        {
            clearInterval(obj.timer);
        }
        else
        {
            value+=speed;
            obj.style.opacity=value/100;
        };
    },30);
};
shop.ui.textChange=function(obj,str){        //清空默认文字
    obj.onfocus=function(){
        if(this.value==str){
            this.value="";
        }
    };
    obj.onblur=function(){
        if(this.value==""){
            this.value=str;
        }
    };
};
shop.ui.moveLeft=function(obj,old,now){        //对象位置左移
    clearInterval(obj.timer);
    obj.timer=setInterval(function(){
        var speed=(now-old)/15;
        speed=Math.round(speed);
        if(now==old){
            clearInterval(obj.timer);
        }
        else{
            old+=speed;
            obj.style.left=old+"px";
        }
    },30);
};
shop.app={};
shop.app.Banner=function(){            //Banner轮播图效果
    var ad=document.getElementById("ad");
    var ul=ad.getElementsByTagName("ul")[0];
    var li=ul.getElementsByTagName("li");

    var iNow=0;
    var timer=setInterval(auto,3000);

    function auto()
    {
        if(iNow==li.length-1)
        {
            iNow=0;
        }
        else{
            iNow++;
        }
        for(var i=0;i<li.length;i++)
        {
            shop.ui.fadeOut(li[i]);
        }
        shop.ui.fadeIn(li[iNow]);
    }
};
shop.app.search=function(){
    var s1=document.getElementById("search1");
    var s2=document.getElementById("search2");
    shop.ui.textChange(s1,"Search website");
    shop.ui.textChange(s2,"Search website");
};
shop.app.sort=function(){            //模拟下拉菜单
    var sor=document.getElementById("sort");
    var sordd=sor.getElementsByTagName("dd");
    var sorul=sor.getElementsByTagName("ul");
    var sorh4=sor.getElementsByTagName("h4");
    for(var i=0;i<sordd.length;i++){
        sordd[i].index=i;
        sordd[i].onclick=function(ev){
            var ev=ev||window.event;
            var This=this;
            for(var n=0;n<sorul.length;n++){
                sorul[n].style.display="none";
            }
            sorul[this.index].style.display="block";

            document.onclick=function(){
                sorul[This.index].style.display=‘none‘;
            };
            ev.cancelBubble=true;
        }
    };

    for(var i=0;i<sorul.length;i++){
        sorul[i].index=i;
        (function(ul){
            var sorli=ul.getElementsByTagName("li");
            for(var i=0;i<sorli.length;i++){
                sorli[i].onmouseover=function(){
                    this.className="active";
                };
                sorli[i].onmouseout=function(){
                    this.className="";
                };
                sorli[i].onclick=function(ev){
                    var ev = ev || window.event;
                    sorh4[this.parentNode.index].innerHTML=this.innerHTML;
                    ev.cancelBubble = true;
                    this.parentNode.style.display="none";
                };
            }
        })(sorul[i]);
    };
};
shop.app.Run=function(){            //点击左移效果
    var slide=document.getElementById(‘slide‘);
    var ul=slide.getElementsByTagName(‘ul‘)[0];
    var li=ul.getElementsByTagName(‘li‘);

    var pre=shop.tools.getByClass(slide,"pre")[0];
    var next=shop.tools.getByClass(slide,"next")[0];

    var iNow=0;

    ul.innerHTML+=ul.innerHTML;
    ul.style.width=li.length*li[0].offsetWidth+"px";

    pre.onclick = function(){
        if(iNow == 0){
            iNow = li.length/2;
            ul.style.left = -ul.offsetWidth/2 + ‘px‘;
        }
        shop.ui.moveLeft(ul,-iNow*li[0].offsetWidth,-(iNow-1)*li[0].offsetWidth);
        iNow--;
    };

    next.onclick = function(){
        if(iNow == li.length/2){
            iNow = 0;
            ul.style.left = 0;
        }
        shop.ui.moveLeft(ul,-iNow*li[0].offsetWidth,-(iNow+1)*li[0].offsetWidth);
        iNow++;
    };
};