Jquery基础（动画效果的轮播图特效）

$(document).ready(function() {
});

$().ready(function() {
});

$(function() {
});

$(‘*‘) / $(‘.div‘) / $(‘div‘) / $(‘#first‘) /

$(‘#first, div, .second‘)

$(‘aside summary‘)  //aside的子元素summary
$(‘aside > details‘)  //aside的直接子元素details
$(‘summary + ul‘)  //summary相邻的下一个兄弟元素ul
$(‘summary ~ ul‘)  //summary之后的所有兄弟元素ul

$(‘[class]‘) 
$(‘[class=tool]‘)
$(‘[class!=tool]‘)  //class不是tool
$(‘[class^=tool_]‘)  //tool_开头
$(‘[class$=vs]‘)  // vs结束
$(‘[class*=vs]‘) //含有vs
$(‘[type][src]‘)
$(‘[class][class*=lang][class$=y]‘)

$(‘details > p:first-child‘)
$(‘details > p:last-child‘)
$(‘details > p:nth-child(2)‘)
$(‘details > p:nth-last-child(2)‘)
$(‘details > p:only-child‘)

$(‘details > p:first-of-type‘)
$(‘details > p:last-of-type‘)
$(‘details > p:nth-of-type(2)‘)
$(‘details > p:nth-last-of-type(2)‘)
$(‘details > p:only-of-type‘)
$(‘p:nth-of-type(3n)‘)

var inputs = $(‘:input‘);
var texts = $(‘:text‘);
var enabled = $(‘:enabled‘);
var disabled = $(‘:disabled‘);
var checked = $(‘:checked‘);
var selected = $(‘:selected‘);

    var js = $(‘aside‘).find(‘.javascript‘);
    var details = $(‘aside‘).children(‘details‘);
    var js_parent = js.parent();
    var sass = less.next();
    var css = less.prev();
    var li = $(‘li‘).eq(8);
    var lis = php.siblings();
    var python = allLis.filter(‘.python‘); //返回带有类名 " python‘" 
var noPython= allLis.not(".python‘") //返回不带有类名 " python”的

DOCTYPE html>
html lang="en">
head>
meta charset="UTF-8">
title>全屏的云南旅游相册title>
link rel="stylesheet" type="text/css" href="css/style.css">
script type="text/javascript" src="js/jquery.js">script>
script type="text/javascript" src="js/script.js">script>
head>
body>
span>span>
nav>
    a href="#">泸沽湖a>
    a href="#">丽江古城a>
    a href="#">茶马古道a>
    a href="#">就这家·云逸客栈a>
    a href="#">西双版纳a>
    a href="#">云南红酒庄a>
    a href="#">轿子雪山a>
    a href="#">普者黑a>
    a href="#">海埂大坝a>
    a href="#">玉龙湾a>
    a href="#">昆明郊野公园a>
    a href="#">欧洲风琴小镇a>
nav>
div>
    img src="images/1.jpg">
    img src="images/2.jpg">
    img src="images/3.jpg">
    img src="images/4.jpg">
    img src="images/5.jpg">
    img src="images/6.jpg">
    img src="images/7.jpg">
    img src="images/8.jpg">
    img src="images/9.jpg">
    img src="images/10.jpg">
    img src="images/11.jpg">
    img src="images/12.jpg">
div>
body>
html>

* { margin: 0; padding: 0; border: none; }

html,
body { overflow: hidden; height: 100%; background: #93b3c6; }

span { display: block; width: 16px; height: 16px; margin: 30px auto 40px; border-radius: 50%; background: #fff; }

nav { position: relative; display: flex; width: 78.125vw; margin: 0 auto 45px; justify-content: space-between; }
nav:before { position: absolute; top: 20px; display: block; width: 100%; height: 10px; content: ""; background: #fff; }
nav > a { font-size: 20px; position: relative; padding: 10px; text-decoration: none; color: #255d7e; border: 2px solid #5395b4; background: #fff; }

div { position: relative; overflow: hidden; width: 78.125vw; height: 75vh; margin: 0 auto; background: #fff; box-shadow: 0 0 30px 0 rgba(8, 1, 3, .3); }
div > img { position: absolute; top: 0; right: 0; bottom: 0; left: 0; width: 98%; height: 96%; margin: auto; }

$(document).ready(function() {
    var index = 0;

    // 鼠标事件
    var mouseEvent = function(event) {
        event.stopPropagation();//阻止冒泡
        //如果是a元素（点击或者hover都可以）
        if ($(this)[0].nodeName == ‘A‘) {
            //索引就是a元素的索引
            index = $(this).index();
        } else {
            return true;
        };
        swiper();
    };

    // 键盘事件
    var keyEvent = function(event) {
        event.stopPropagation();
        if (event.keyCode == 37) {
            // 向左箭头
            index = index > 0 ? --index : $(‘a‘).length - 1;
        } else if (event.keyCode == 39) {
            // 向右箭头
            index = index ;
        } else {
            return true;
        }
        swiper();
    }

    // 定义鼠标事件和键盘事件
    var events = {
        mouseenter: mouseEvent,
        keydown: keyEvent
    };
    // 给a元素添加鼠标事件和键盘事件
    $(‘a‘).add(document).on(events);

    var swiper = function() {
        $(‘img‘).eq(index)
        .stop().fadeIn(‘slow‘)
        .siblings()
        .stop().fadeOut(‘slow‘);
    }

    // 初始化默认显示第一张图
    var init = function() {
        index = 0;
        swiper();
    }
    init();
});