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2024-09-27 02:06:13 +08:00
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历届学生/吴欣阳/项目开发/上课项目/js案例/preview.html Normal file
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>预览</title>
<link rel="stylesheet" href="http://at.alicdn.com/t/font_2576965_p89wlanilpr.css">
<style>
body,
ul,
li,
a,
p,
h1,
h2,
h3,
h4,
h5,
h6 {
margin: 0;
padding: 0;
list-style: none;
text-decoration: none;
}
.smallImg {
width: 100px;
}
.zhezhao {
width: 100vw;
height: 100vh;
background: #000;
position: fixed;
left: 0;
right: 0;
top: 0;
bottom: 0;
z-index: 998;
opacity: .5;
}
.preview {
position: fixed;
left: 0;
right: 0;
top: 0;
bottom: 0;
z-index: 999;
display: flex;
justify-content: center;
}
.closed {
width: 40px;
height: 40px;
font-size: 24px;
color: #fff;
background-color: #606266;
text-align: center;
line-height: 35px;
position: absolute;
right: 10px;
top: 10px;
border-radius: 100%;
}
.action .d {
top: 50%;
transform: translateY(-50%);
width: 44px;
height: 44px;
font-size: 24px;
color: #fff;
background-color: #606266;
border-color: #fff;
position: absolute;
text-align: center;
line-height: 40px;
border-radius: 100%;
}
.left {
left: 40px;
}
.right {
right: 40px;
}
.operation {
left: 50%;
bottom: 30px;
transform: translateX(-50%);
width: 282px;
height: 44px;
padding: 0 23px;
background-color: #606266;
border-color: #fff;
position: absolute;
border-radius: 22px;
display: flex;
justify-content: space-around;
align-items: center;
}
.operation li {}
.operation li i {
font-size: 23px;
color: #fff;
}
.xz {
display: inline-block;
transform: rotateY(180deg);
}
.mainImg {
height: 100%;
}
</style>
</head>
<body>
<img class="smallImg" src="./img/1.jpg" alt="">
<div class="zhezhao"></div>
<div class="preview">
<div class="closed">x</div>
<div class="action">
<div class="left d">&lt;</div>
<div class="right d">&gt;</div>
</div>
<img class="mainImg" style="transform: scale(1) rotate(0deg);margin-left: 0;margin-top: 0;" src="./img/4.jpg" alt="">
<ul class="operation">
<li>
<i class="iconfont icon-suoxiao suoxiao"></i>
</li>
<li>
<i class="iconfont icon-fangda fangda"></i>
</li>
<li>
<i class="iconfont icon-fullscreen fullscreen"></i>
</li>
<li class="xz">
<i class="iconfont icon-shuaxin leftshuaxin"></i>
</li>
<li>
<i class="iconfont icon-shuaxin rightshuaxin"></i>
</li>
</ul>
</div>
</body>
<script>
var suoxiao = $(".suoxiao"),
fangda = $(".fangda"),
fullscreen = $(".fullscreen"),
leftshuaxin = $(".leftshuaxin"),
rightshuaxin = $(".rightshuaxin");
var x1, y1, l, t;
// 当鼠标在图片上按下的时候，修改这个变量为true，
// 如果鼠标滑动超过图片的区域，因为这个变量未true，
// 所以if判断通过，给背景层绑定移动事件实现可以继续拖动图片
// 当用户在背景层松开鼠标后，将这个变量改为false。
// 这样当用户在未按下图片但是从图片上滑动超过图片区域的时候，因为这个变量是false
// 所以不会执行，在背景层滑动鼠标图片也跟着一起移动的事件绑定
var isBackMove = false;
suoxiao.onclick = function () {
var value = Scale() - 0.2;
if (value != 0) {
$(".mainImg").style.transform = `scale(${value}) rotate(${Rotate()}deg)`
}
}
fangda.onclick = function () {
$(".mainImg").style.transform = `scale(${Scale() + 0.2}) rotate(${Rotate()}deg)`
}
fullscreen.onclick = function () {
$(".mainImg").style.transform = `scale(2) rotate(${Rotate()}deg)`
}
// -90
leftshuaxin.onclick = function () {
xuanzhuan(-90)
}
// +90
rightshuaxin.onclick = function () {
xuanzhuan(90)
}
// 鼠标在图片上按下的时候
$(".mainImg").onmousedown = function (e) {
console.log("鼠标在图片上按下的时候");
e.preventDefault()
isBackMove = true
//获取鼠标按下的坐标
x1 = e.clientX;
y1 = e.clientY;
l = parseInt($(".mainImg").style.marginLeft);
t = $(".mainImg").offsetTop;
ImgMove(".mainImg")
}
// 按住拖动，但鼠标从图片上离开的
// 给背景层绑定鼠标移动事件
$(".mainImg").onmouseleave = function () {
console.log("鼠标从图片上离开的，给背景层绑定鼠标移动事件");
if (isBackMove) {
ImgMove(".preview")
}
}
// 鼠标在图片上松开
$(".mainImg").onmouseup = function (ev) {
console.log("鼠标在图片上松开");
$(".mainImg").onmousemove = null;
$(".preview").onmousemove = null;
}
// 鼠标在背景层上松开
$(".preview").onmouseup = function (ev) {
console.log("鼠标在背景层上松开");
isBackMove = false
$(".mainImg").onmousemove = null;
$(".preview").onmousemove = null;
}
function ImgMove(className) {
$(className).onmousemove = function (ev) {
var x2 = ev.clientX;
var y2 = ev.clientY;
//计算出鼠标的移动距离
var x = x2 - x1;
var y = y2 - y1;
//移动的数值与元素的left，top相加，得出元素的移动的距离
var lt = y + t;
var ls = x + l;
//更改元素的left，top值
$(".mainImg").style.marginLeft = ls + 'px';
$(".mainImg").style.marginTop = lt + 'px';
}
}
// 左右旋转的代码封装
function xuanzhuan(offset) {
$(".mainImg").style.transform = `scale(${Scale()}) rotate(${Rotate() + offset}deg)`
}
// 获取缩放
function Scale() {
return Number($(".mainImg").style.transform.match(/scale\(([\s\S]*?)\) /)[1])
}
// 获取旋转的数值
function Rotate() {
return Number($(".mainImg").style.transform.match(/rotate\(([\s\S]*?)deg\)/)[1])
}
function $(a) {
return document.querySelector(a)
}
</script>
</html>