function banner(){
    var banner= document.getelementsbyclassname('banner')[0]
    var bw=banner.getelementsbyclassname('b-wrap')[0]
    var oul=bw.getelementsbytagname('ul')[0]
    var num=0
    var len=arrimg.length
    var time=null
    var flag=true
    document.onmouseover=function(){
        if(flag){
            time=setinterval(function(){
                num++
                bw.style.backgroundimage=arrimg[num%arrimg.length]

                if(num>len-1){

                    num=0
                }
                for (var k = 0; k < ali.length; k++) {
                    ali[k].classname = ''
                }
                ali[num].classname = 'active'
                bw.style.backgroundimage = arrimg[num]

                if(num<0){
                    num=len-1

                }
                for (var k = 0; k < ali.length; k++) {
                    ali[k].classname = ''
                }
                ali[num].classname = 'active'
                bw.style.backgroundimage = arrimg[num]
            },2000)
            flag=false
        }else
        {		clearinterval(time)
            time=null
            flag=true
        }
    }

    var s =''
    for(var i=0;i<arrimg.length;i++){
        s+='<li>'+(i+1)+'</li>'
    }
    oul.innerhtml=s
    var ali=oul.getelementsbytagname('li')
    ali[0].classname='active'
    for (var j = 0; j < ali.length; j++) {
        ali[j].index = j
        ali[j].onmouseover = function () {

            num = this.index
            for (var k = 0; k < ali.length; k++) {
                ali[k].classname = ''
            }
            ali[num].classname = 'active'
            bw.style.backgroundimage = arrimg[num]
        }
    }
}

function newsbanner(){
    var box =document.getelementbyid('box');
    var imga =document.getelementbyid('img1');
    var a =document.getelementbyid('url');
    var left =document.getelementbyid('left');
    var right =document.getelementbyid('right');
    var text =document.getelementbyid('text');
    var year =document.getelementbyid('newsyear');
    var month =document.getelementbyid('newsmonth');
    // 构造图片和文字数组

   // var arr_url =['','',''];
    // 图片轮播
    var currentindex = 1;
    var size = newsdata.length;
    var  b = true;
    function slide(){
        b = false;
        if (typeof newsdata !== 'undefined') {
            imga.src = newsdata[currentindex].src;
            imga.classname = newsdata[currentindex].contentid
            text.innertext =newsdata[currentindex].name
            year.innertext = newsdata[currentindex].year
            month.innertext = newsdata[currentindex].month
            currentindex =++currentindex%size;
            newsdata[currentindex].contentid;
          $.each($("#new_num ul > li"),function (i,item){
              $(item).attr("id") == newsdata[currentindex].contentid ? $(item).addclass('active') : $(item).removeclass('active')
          })
            b = true;
        }
     //   a.href = arr_url[currentindex];
    }
    // 使用setinterval完成轮播
    var pause =setinterval(slide,2000);
    // 鼠标悬停时，停止轮播
    // 使用clearinterval来完成
    box.addeventlistener('mouseover',function(){
        clearinterval(pause);

    });
    // 鼠标离开后，继续轮播
    box.addeventlistener('mouseout',function(){
        pause =setinterval(slide,2000);
    })
    // 手动切换图片
    left.addeventlistener('click',function(){
        currentindex = --currentindex%size;
        if(currentindex < 0){
            currentindex +=size;
        }
        imga.src = newsdata[currentindex].src;
        text.innertext = newsdata[currentindex].name;
        year.innertext = newsdata[currentindex].year
        month.innertext = newsdata[currentindex].month
        $.each($("#new_num ul >li"),function (index,item){
            if($(item).attr("id") == newsdata[currentindex].contentid){
                $(item).addclass("active");
                $(item).siblings().removeclass("active")
            }
        })
    })
    right.addeventlistener('click',function(){
        currentindex =++currentindex%size;
        imga.src = newsdata[currentindex].src;
        text.innertext = newsdata[currentindex].name;
        year.innertext = newsdata[currentindex].year
        month.innertext = newsdata[currentindex].month
        $.each($("#new_num ul >li"),function (index,item){
            if($(item).attr("id") == newsdata[currentindex].contentid){
                $(item).addclass("active");
                $(item).siblings().removeclass("active")
            }
        })
    })
}


function btn_newli(obj,id){
    var imga =document.getelementbyid('img1');
    var text =document.getelementbyid('text');
    var year =document.getelementbyid('newsyear');
    var month =document.getelementbyid('newsmonth');
    $.each(newsdata,function (i,item){
        if(item.contentid == id){
            imga.src = item.src;
            text.innertext = item.name;
            year.innertext = item.year
            month.innertext = item.month
        }
    })
    $(obj).addclass("active");
    $(obj).siblings().removeclass("active")
}

function abountusbanner(){
    var aboutb =document.getelementbyid('about');
    var imgb =document.getelementbyid('img3');
    var left =document.getelementbyid('about_left');
    var right =document.getelementbyid('about_right');
    // 图片轮播
    var currentindex =0;
    var size = aboutimg.length;
    function slide(){
        currentindex =  ++currentindex%size ;
        imgb.src = aboutimg[currentindex];
    }
    // 使用setinterval完成轮播
    var pause =setinterval(slide,2000);
    // 鼠标悬停时，停止轮播
    // 使用clearinterval来完成
    aboutb.addeventlistener('mouseover',function(){
        clearinterval(pause);

    });
    // 鼠标离开后，继续轮播
    aboutb.addeventlistener('mouseout',function(){
        pause =setinterval(slide,2000);
    })

    left.addeventlistener('click',function(){
        currentindex = --currentindex;
        if(currentindex < 0){
            currentindex = aboutimg.length-1;
        }
        imgb.src = aboutimg[currentindex];
    })

    right.addeventlistener('click',function(){
        currentindex = ++currentindex;
        if (currentindex > aboutimg.length-1) {
            currentindex = 0;
        }
        imgb.src = aboutimg[currentindex];
    })
}