10-jQuery02

2018-12-28  本文已影响4人  努力爬行中的蜗牛
尺寸相关、滚动事件

1、获取和设置元素的尺寸

width()、height() 获取元素的width和height
innerWidth()、innerHeight() 包括padding的width和height
outerWidth()、outerHeight() 包括padding和border的width和height
outerWidth(true)、outerHeight(true) 包括padding和border以及margin的margin的width和height

<!DOCTYPE html>
<html>
<head>
    <title>jquery</title>
    <script type="text/javascript" src="js/jquery.js"></script>

    <script type="text/javascript">
        $(function() {
            var $div = $('.box');
            // 盒子内容的尺寸
            console.log($div.width());
            console.log($div.height());

            // 盒子内容+padding的尺寸
            console.log($div.innerWidth());
            console.log($div.innerHeight());

            // 盒子的真实尺寸：内容+padding+border
            console.log($div.outerWidth());
            console.log($div.outerHeight());
            
            // 盒子的真实尺寸+margin
            console.log($div.outerWidth(true));
            console.log($div.outerHeight(true));


        });
    </script>

    <style type="text/css">
        .box {
            width: 300px;
            height: 200px;
            padding: 20px;
            border: 10px solid #000;
            margin: 20px;
            background-color: gold;
        }
    </style>
</head>
<body>
    <div class="box"></div>


</body>
</html>

加入购物车demo

<!DOCTYPE html>
<html>
<head>
    <title>jquery</title>
    <script type="text/javascript" src="js/jquery.js"></script>

    <script type="text/javascript">
        $(function() {
            var $chart = $('.chart');
            var $count = $('.chart em');
            var $btn = $('.add');
            var $point = $('.point');

            var $w01 = $btn.outerWidth();
            var $h01 = $btn.outerHeight();

            var $w02 = $chart.outerWidth();
            var $h02 = $chart.outerHeight();

            $btn.click(function(){
                var oPos01 = $btn.offset();
                var oPos02 = $chart.offset();

                $point.css({'left':oPos01.left + parseInt($w01/2) - 8,'top':oPos01.top + parseInt($h01/2) - 8});
                $point.show();

                $point.animate({'left':oPos02.left + parseInt($w02/2) - 8,'top':oPos02.top + parseInt($h02/2) - 8},800,function() {
                    $point.hide();

                    var iNum = $count.html();
                    $count.html(parseInt(iNum) + 1);
                });
            })
        });
    </script>

    <style type="text/css">
        .chart {
            width: 150px;
            height: 50px;
            border: 2px solid #000;
            text-align: center;
            line-height: 50px;
            float: right;
            margin-right: 100px;
            margin-top: 50px;
        }

        .chart em {
            font-style: normal;
            color: red;
            font-weight: bold;
        }

        .add {
            width: 100px;
            height: 50px;
            border: 0;
            background-color: green;
            color: #fff;
            float: left;
            margin-top: 300px;
            margin-left: 300px;
        }

        .point {
            width: 16px;
            height: 16px;
            background-color: red;
            position: fixed;
            left: 0;
            top: 0;
            display: none;
            z-index: 9999;
        }
    </style>
</head>
<body>
    <div class="chart">购物车<em>0</em></div>
    <input type="button" name="" value="加入购物车" class="add">

    <div class="point"></div>
</body>
</html>

2、获取元素相对页面的绝对位置

offset()

3、获取浏览器可视区宽度高度

$(window).width();
$(window).height();

4、获取页面文档的宽度高度

$(document).width();
$(document).height();

5、获取页面滚动距离

$(document).scrollTop();
$(document).scrollLeft();

6、页面滚动事件

$(window).scroll(function() {
...
});

<!DOCTYPE html>
<html>
<head>
    <title>js</title>
    <script type="text/javascript" src="js/jquery.js"></script>

    <script type="text/javascript">
        $(function() {
            console.log('可视区的宽度:'+ $(window).width());

            console.log('可视区的高度:'+ $(window).height());

            console.log('文档的宽度:'+ $(document).width());

            console.log('文档的宽度:'+ $(document).height());
        });
            
    </script>
</head>
<body>
    <p>文档内容</p>
    <br>
    <br>
    <br>
    <br>
    <br>
    <p>文档内容</p>
    <br>
    <br>
    <br>
    <br>
    <br>
    <p>文档内容</p>
    <br>
    <br>
    <br>
    <br>
    <br>
    <p>文档内容</p>
    <br>
    <br>
    <br>
    <br>
    <br>
    <p>文档内容</p>
    <br>
    <br>
    <br>
    <br>
    <br>
    <p>文档内容</p>
    <br>
    <br>
    <br>
    <br>
    <br>
    <p>文档内容</p>
    <br>
    <br>
    <br>
    <br>
    <br>

</body>
</html>

悬浮菜单、滚动到顶部

<!DOCTYPE html>
<html>
<head>
    <title>js</title>
    <script type="text/javascript" src="js/jquery.js"></script>

    <script type="text/javascript">
        $(function() {
            console.log('可视区的宽度:'+ $(window).width());

            console.log('可视区的高度:'+ $(window).height());

            console.log('文档的宽度:'+ $(document).width());

            console.log('文档的宽度:'+ $(document).height());
        });
            
    </script>

    <style type="text/css">
        .banner {
            width: 960px;
            height: 200px;
            background-color: cyan;
            margin: 0 auto;
        }

        .menu {
            width: 960px;
            height: 80px;
            background-color: gold;
            margin: 0 auto;
            text-align: center;
            line-height: 80px;
        }

        .menu_back {
            width: 960px;
            height: 80px;
            margin: 0 auto;
            display: none;
        }

        p {
            text-align: center;
        }

        .totop {
            width: 60px;
            height: 60px;
            background-color: #000;
            color: #fff;
            position: fixed;
            right: 20px;
            bottom: 50px;
            line-height: 60px;
            text-align: center;
            font-size: 40px;
            border-radius: 50%;
            cursor: pointer;
            display: none;
        }
    </style>

    <script type="text/javascript" src="js/jquery.js"></script>

    <script type="text/javascript">
        $(function() {
            var $menu = $('.menu');
            var $menu_back = $('.menu_back');
            var $totop = $('.totop');

            $(window).scroll(function() {
                var iNum = $(document).scrollTop();
                if (iNum > 200) {
                    $menu.css({
                        'position':'fixed',
                        'left':'50%',
                        'top':0,
                        'marginLeft':-480,
                    });

                    $menu_back.show();
                } else {
                    $menu.css({
                        'position':'static',
                        'marginLeft':'auto'
                    })

                    $menu_back.hide();
                }

                if (iNum > 400) {
                    $totop.fadeIn();
                } else {
                    $totop.fadeOut();
                }
            });

            $totop.click(function() {
                $('html,body').animate({'scrollTop':0});
            })
        });
    </script>
</head
<body>
    <div class="banner"></div>
    <div class="menu">菜单</div>
    <div class="menu_back"></div>
    <div class="totop">↑</div>


    <p>文档内容</p>
    <br>
    <br>
    <br>
    <br>
    <br>
    <p>文档内容</p>
    <br>
    <br>
    <br>
    <br>
    <br>
    <p>文档内容</p>
    <br>
    <br>
    <br>
    <br>
    <br>
    <p>文档内容</p>
    <br>
    <br>
    <br>
    <br>
    <br>
    <p>文档内容</p>
    <br>
    <br>
    <br>
    <br>
    <br>
    <p>文档内容</p>
    <br>
    <br>
    <br>
    <br>
    <br>
    <p>文档内容</p>
    <br>
    <br>
    <br>
    <br>
    <br>

</body>
</html>
jquery属性操作

1、html()取出或这是html内容

// 取出html内容
var $htm = $('#div ').html();
// 设置html内容
$('#div1 ').html('<span>添加文字</span>');

2、prop()取出或设置某个属性的值

 // 取出图片的地址
var $src = $('#img ').prop('src');
// 设置图片的地址和alt属性
$('#img1 ').prop({src:"text.jpg","alt":"Test Image"});

<!DOCTYPE html>
<html>
<head>
    <title>js</title>
    <script type="text/javascript" src="js/jquery.js"></script>
    <script type="text/javascript">
        $(function() {
            var $a = $('.link');
            var $img = $('#img01');
            var $div = $('#div1');

            // 读取属性值
            console.log($a.prop('class'));
            // 没有设置的属性读取为空
            console.log($a.prop('title'));

            // 读取的图片的绝对的地址
            console.log($img.prop('src'));

            // 设置属性值
            $a.prop({'href':'http://www.baidu.com','title':'百度地址'});

            // 读取标签内包裹的内容
            console.log($a.html());
            $div.html('<span>div里面的span标签</span>')


        })
    </script>
</head>
<body>
    <a href="#" class="link">这是一个链接</a>
    <img src="images/002.jpg" id="img01" alt="水果">

    <div id="div1"></div>

</body>
</html>

手风琴效果

<!doctype html>
<html>
<head>
<meta charset="utf-8">
<script type="text/javascript" src="js/jquery-1.12.4.min.js"></script>
<style>
*{margin:0;padding:0;}
body{font-size:12px;}
#accordion{width:727px; height:350px; margin:100px auto 0 auto; position:relative; overflow:hidden; border:1px solid #CCC;}
#accordion ul{list-style:none;}
#accordion ul li{width:643px;height:350px; position:absolute; background:#FFF;}
#accordion ul li span{display:block;width:20px; height:350px; float:left; text-align:center; color:#FFF; padding-top:5px; cursor:pointer;}
#accordion ul li img{display:block; float:right;}
.bar01{left:0px;}
.bar02{left:643px;}
.bar03{left:664px;}
.bar04{left:685px;}
.bar05{left:706px;}
.bar01 span{background:#09E0B5;}
.bar02 span{background:#3D7FBB;}
.bar03 span{background:#5CA716;}
.bar04 span{background:#F28B24;}
.bar05 span{background:#7C0070;}
</style>

<script type="text/javascript">

    $(function(){

        $('#accordion li').click(function() {       
            
            $(this).animate({left:$(this).index()*21});         

            $(this).prevAll().each(function(){              

                $(this).animate({left:$(this).index()*21});
                
            });

            $(this).nextAll().each(function(){
                
                $(this).animate({left:(727-(5-$(this).index())*21)});               
            });


        });


    })


</script>


<title>手风琴效果</title>
</head>

<body>
<div id="accordion">
    <ul>
    <li class="bar01"><span>非洲景色01</span><img src="images/001.jpg" /></li>
    <li class="bar02"><span>非洲景色02</span><img src="images/002.jpg" /></li>
    <li class="bar03"><span>非洲景色03</span><img src="images/003.jpg" /></li>
    <li class="bar04"><span>非洲景色04</span><img src="images/004.jpg" /></li>
    <li class="bar05"><span>非洲景色05</span><img src="images/005.jpg" /></li>
    </ul>
</div>
</body>
</html>
jquery循环

对jQuery选择的对象集合分别进行操作，需要用到juqery循环操作，此时可以用对象的each方法：

<!DOCTYPE html>
<html>
<head>
    <title>jquery循环</title>
    <script type="text/javascript" src="js/jquery.js"></script>
    <script type="text/javascript">
        $(function() {
            var $li = $('.list li');
            $li.each(function() {
                //alert($(this).html())
                if ($(this).index() % 2 == 0) {
                    $(this).css({"background": "gold"});
                }
            })
        })
    </script>

</head>
<body>
    <ul class="list">
        <li>1</li>
        <li>2</li>
        <li>3</li>
        <li>4</li>
        <li>5</li>
        <li>6</li>
        <li>7</li>
        <li>8</li>
    </ul>

</body>
</html>
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