1. 程式人生 > >jQuery整屏滾動

jQuery整屏滾動

1.jQuery.mousewheel外掛使用

jQuery中沒有滑鼠滾輪事件,原生js中的滑鼠滾輪事件不相容,可以使用jQuery的滾輪事件外掛
jQuery.mousewheel.js

2.函式節流

JavaScript中有些事件的觸發頻率非常高,比如onresize事件(jq中是resize),onmousemove事件(jq中是mousemove)以及上面說的滑鼠滾輪事件,在短事件內多處觸發執行繫結的函式,可以巧妙地使用定時器來減少觸發的次數,實現函式節流。

例子:整屏滾動

<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>滾輪事件</title>
<script type="text/javascript" src="../jQuery庫/jquery-3.3.1.min.js"></script>
<script type="text/javascript" src="../jQuery庫/jquery.mousewheel.js"></script>
<link rel="stylesheet" type="text/css" href="../CSS3/wheelstyle.css">
<script type="text/javascript">

/*$(window).mousewheel(function(event,data){
    滑鼠滾輪向上1,向下-1
    alert(data);

    console.log(data);*/

/*})*/
$(function(){
    var $screen = $('.pages_con'); /*獲取整個父級div*/
    var $pages = $('.pages');      /*獲取頁面div*/
    var $h = $(window).height();   /*視窗的高度*/
    //alert($h);
    var $nowscreen = 0;             /*重新整理次數變數*/
    var $len = $pages.length;       /*有多少個頁面div*/
    var $points = $('.points li');  /*獲取li*/
    var timer = null;               /*定時變數為空值*/

    $pages.css({'height':$h});      /*修改頁面樣式,高度設為可視視窗大小*/

    $points.click(function(){       /*點選li即小圓點,執行*/
        $nowscreen = $(this).index();  /*重新整理次數變數=點選的數值*/

        /*第幾個li,增加active類,同輩的li刪除active類*/
        $points.eq($nowscreen).addClass('active').siblings().removeClass('active');

        /*父級div樣式top值,等於負的可視螢幕大小*重新整理數*/
        $screen.animate({'top':-$h*$nowscreen});
        //document.title=$nowscreen;

        /*頁面div的第幾個,增加moving類,同輩的div刪除moving類*/
        $pages.eq($nowscreen).addClass('moving').siblings().removeClass('moving');
    })

    /*滑鼠滾輪函式,事件變數event,滾輪次數dat*/
    $(window).mousewheel(function(event,dat){

        /*沒執行一次清空timer變數,重新計算*/
        clearTimeout(timer);

        /*定時器函式*/
        timer = setTimeout(function(){

            /*向下滾*/
            if(dat==-1){
            $nowscreen++;
        }
        /*向上滾*/
        else{
            $nowscreen--;
        }
        /*最頂部限定0*/
        if($nowscreen<0){
            $nowscreen=0;
        }
        /*最底部限定4,0-4*/
        if($nowscreen>$len-1){
            $nowscreen = $len-1
        }

        $screen.animate({'top':-$h*$nowscreen});
        //document.title=$nowscreen;
        $pages.eq($nowscreen).addClass('moving').siblings().removeClass('moving');
        $points.eq($nowscreen).addClass('active').siblings().removeClass('active');
        },200)

    })
})
</script>

</head>

<body>

<div class="pages_con">
    <div class="pages">
        <div class="main_con">
            <div class="left_img">
                <img src="../images/1.png" alt="boy&girl">
            </div>
            <div class="right_info">日常裡,與你相抱</div>
        </div>
    </div>
    <div class="pages page2">
        <div class="main_con">
            <div class="left_img">
                <img src="../images/2.png" alt="櫻花美">
            </div>
            <div class="right_info">櫻花下,是你的小提琴</div>
        </div>
    </div>
    <div class="pages page3">
        <div class="main_con">
            <div class="left_img">
                <img src="../images/3.png" alt="星空">
            </div>
            <div class="right_info">星空下,你我偶遇</div>
        </div>
    </div>
    <div class="pages page4">
        <div class="main_con">
            <div class="left_img">
                <img src="../images/4.png" alt="黃昏美">
            </div>
            <div class="right_info">黃昏時,一人獨奏</div>
        </div>
    </div>
    <div class="pages page5">
        <div class="main_con">
            <div class="left_img">
                <img src="../images/5.png" alt="櫻花帥">
            </div>
            <div class="right_info">琴聲中,櫻花飄揚</div>
        </div>
    </div>
    <ul class="points">
        <li class="active"></li>
        <li></li>
        <li></li>
        <li></li>
        <li></li>
    </ul>
</div>

</body>
</html>

CSS檔案:

/ CSS Document /
body,ul{
margin: 0; /取消列表和系統自帶縮排/
padding: 0;
}
ul{
list-style: none;
}
/父級div/
.pages_con{
position: fixed;
left: 0;
top: 0;
width: 100%;
overflow: hidden;
}
/每一頁面/
.pages{
height: 768px;
position: relative;
}
/小圓點ul/
.points{
width: 16px;
height: 176px;
position: fixed;
right: 20px;
top: 50%;
margin-top: -88px;
}
/每一個小圓點/
.points li{

width: 13px;
height: 13px;
border-radius: 50%;
margin: 16px 0;
border: 1px solid #666;
cursor: pointer;

}
/jQuery操作類/
.points .active{
background-color: #666666;
}
/頁面大小/
.main_con{

width: 1366px;
height: 768px;
position: relative;

}

/頁面的圖片/
.main_con .left_img{
position: relative;
left: -40px;
opacity: 0;
filter: alpha(opacity=0);
transition: all 1000ms ease 300ms;
}
/頁面的文字/
.main_con .right_info{
width: 40px;
height: 300px;
position: absolute;
left: -50px;
top: 50%;
margin-top: -150px;
font-size: 30px;
color: #666666;
text-align: justify;
opacity: 0;
filter: alpha(opacity=0);
transition: all 1000ms ease 300ms;
}
/jQuery操作動畫/
.moving .main_con .left_img{
left: 0;
opacity: 1;
filter: alpha(opacity=100);

}
.moving .main_con .right_info{
left: 30px;
opacity: 1;
filter: alpha(opacity=100);

}

jQuery整屏滾動