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html部分
<template>
<div class="drag-wrapper" ref="dragDiv">
<div class="drag_bg"></div>
<div class="drag_text f14">{{ confirmWords }}</div>
<!-- 移动的模块 -->
<div ref="moveDiv"
@mousedown="mousedownFn($event)"
:class="{'handler_ok_bg': confirmSuccess}"
class="handler handler_bg"></div>
</div>
</template>
css部分: 由于担心图片源的问题，所以写成了base64的图片
<style scoped>
.drag{
position: relative;
background-color: #e8e8e8;
width: 100%;
height: 40px;
line-height: 40px;
text-align: center;
}
.handler{
width: 40px;
height: 40px;
border: 1px solid #ccc;
cursor: move;
position: absolute;top: 0px;left: 0px;
}
.handler_bg{
background: #fff url("data:image/png;base64,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") no-repeat center;
}
.handler_ok_bg{
background: #fff url("data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABAAAAAQCAYAAAAf8/9hAAAAGXRFWHRTb2Z0d2FyZQBBZG9iZSBJbWFnZVJlYWR5ccllPAAAA3hpVFh0WE1MOmNvbS5hZG9iZS54bXAAAAAAADw/eHBhY2tldCBiZWdpbj0i77u/IiBpZD0iVzVNME1wQ2VoaUh6cmVTek5UY3prYzlkIj8+IDx4OnhtcG1ldGEgeG1sbnM6eD0iYWRvYmU6bnM6bWV0YS8iIHg6eG1wdGs9IkFkb2JlIFhNUCBDb3JlIDUuNS1jMDIxIDc5LjE1NTc3MiwgMjAxNC8wMS8xMy0xOTo0NDowMCAgICAgICAgIj4gPHJkZjpSREYgeG1sbnM6cmRmPSJodHRwOi8vd3d3LnczLm9yZy8xOTk5LzAyLzIyLXJkZi1zeW50YXgtbnMjIj4gPHJkZjpEZXNjcmlwdGlvbiByZGY6YWJvdXQ9IiIgeG1sbnM6eG1wTU09Imh0dHA6Ly9ucy5hZG9iZS5jb20veGFwLzEuMC9tbS8iIHhtbG5zOnN0UmVmPSJodHRwOi8vbnMuYWRvYmUuY29tL3hhcC8xLjAvc1R5cGUvUmVzb3VyY2VSZWYjIiB4bWxuczp4bXA9Imh0dHA6Ly9ucy5hZG9iZS5jb20veGFwLzEuMC8iIHhtcE1NOk9yaWdpbmFsRG9jdW1lbnRJRD0ieG1wLmRpZDo0ZDhlNWY5My05NmI0LTRlNWQtOGFjYi03ZTY4OGYyMTU2ZTYiIHhtcE1NOkRvY3VtZW50SUQ9InhtcC5kaWQ6NDlBRDI3NjVGMkQ2MTFFNEI5NDBCMjQ2M0ExMDQ1OUYiIHhtcE1NOkluc3RhbmNlSUQ9InhtcC5paWQ6NDlBRDI3NjRGMkQ2MTFFNEI5NDBCMjQ2M0ExMDQ1OUYiIHhtcDpDcmVhdG9yVG9vbD0iQWRvYmUgUGhvdG9zaG9wIENDIDIwMTQgKE1hY2ludG9zaCkiPiA8eG1wTU06RGVyaXZlZEZyb20gc3RSZWY6aW5zdGFuY2VJRD0ieG1wLmlpZDphNWEzMWNhMC1hYmViLTQxNWEtYTEwZS04Y2U5NzRlN2Q4YTEiIHN0UmVmOmRvY3VtZW50SUQ9InhtcC5kaWQ6NGQ4ZTVmOTMtOTZiNC00ZTVkLThhY2ItN2U2ODhmMjE1NmU2Ii8+IDwvcmRmOkRlc2NyaXB0aW9uPiA8L3JkZjpSREY+IDwveDp4bXBtZXRhPiA8P3hwYWNrZXQgZW5kPSJyIj8+k+sHwwAAASZJREFUeNpi/P//PwMyKD8uZw+kUoDYEYgloMIvgHg/EM/ptHx0EFk9I8wAoEZ+IDUPiIMY8IN1QJwENOgj3ACo5gNAbMBAHLgAxA4gQ5igAnNJ0MwAVTsX7IKyY7L2UNuJAf+AmAmJ78AEDTBiwGYg5gbifCSxFCZoaBMCy4A4GOjnH0D6DpK4IxNSVIHAfSDOAeLraJrjgJp/AwPbHMhejiQnwYRmUzNQ4VQgDQqXK0ia/0I17wJiPmQNTNBEAgMlQIWiQA2vgWw7QppBekGxsAjIiEUSBNnsBDWEAY9mEFgMMgBk00E0iZtA7AHEctDQ58MRuA6wlLgGFMoMpIG1QFeGwAIxGZo8GUhIysmwQGSAZgwHaEZhICIzOaBkJkqyM0CAAQDGx279Jf50AAAAAABJRU5ErkJggg==") no-repeat center;
}
.drag_bg{
background-color: #7ac23c;
height: 40px;
width: 0px;
}
.drag_text{
position: absolute;
top: 0px;
width: 100%;text-align: center;
-moz-user-select: none;
-webkit-user-select: none;
user-select: none;
-o-user-select:none;
-ms-user-select:none;
}
</style>
定义参数
data() {
return {
beginClientX:0, // 距离屏幕左端距离
mouseMoveStata:false, // 触发拖动状态 判断
maxwidth:'', // 拖动最大宽度，依据滑块宽度算出来的
confirmWords:'拖动滑块验证', // 滑块文字
confirmSuccess:false // 验证成功判断
}
}
mounted() {
// 根据滑块宽度计算可拖动最大宽度
this.maxwidth = this.$refs.dragDiv.clientWidth - this.$refs.moveDiv.clientWidth
// 监听手指的触摸事件
document.getElementsByTagName('html')[0].addEventListener('mousemove', this.mouseMoveFn)
// 监听手指离开事件
document.getElementsByTagName('html')[0].addEventListener('mouseup', this.moseUpFn)
}
首先判断是否触发拖动状态,然后计算拖动的距离和模块距离，实时赋值
//验证成功函数
mouseMoveFn(e){
if(this.mouseMoveStata){
let width = e.clientX - this.beginClientX
if(width > 0 && width <= this.maxwidth) {
document.getElementsByClassName('handler')[0].style.left = width + 'px'
document.getElementsByClassName('drag_bg')[0].style.width = width + 'px'
}else if(width > this.maxwidth) this.successFunction()
}
},
把拖动状态改成false，并且把滑块移到对应的手指落下位置上
moseUpFn(e) {
this.mouseMoveState = !1 // 修改状态
const width = e.clientX - this.beginClientX // 计算获取宽度
if(width < this.maxwidth) { // 当宽度小于模块的宽度时，赋值
document.getElementsByClassName('handler')[0].style.left = 0 + 'px'
document.getElementsByClassName('drag_bg')[0].style.width = 0 + 'px'
}
}
在上面html部分的handler块里，定义了mousedown事件(mousedownFn($event))
需要阻止文件选中等浏览器默认行为，并把触发拖动状态这个阈值打开，记录手指移动的距离
mousedownFn:function (e) {
e.preventDefault && e.preventDefault() // 阻止文字选中等 浏览器默认事件
this.mouseMoveStata = true // 把触发拖动状态这个阈值打开
this.beginClientX = e.clientX // 记录手指移动的距离
},
至此，功能就完成了。。
完整的JS代码如下
<script>
export default {
data(){
return {
beginClientX:0, /*距离屏幕左端距离*/
mouseMoveStata:false, /*触发拖动状态 判断*/
maxwidth:'', /*拖动最大宽度，依据滑块宽度算出来的*/
confirmWords:'拖动滑块验证', /*滑块文字*/
confirmSuccess:false /*验证成功判断*/
}
},
mounted(){
this.maxwidth = this.$refs.dragDiv.clientWidth - this.$refs.moveDiv.clientWidth
document.getElementsByTagName('html')[0].addEventListener('mousemove',this.mouseMoveFn)
document.getElementsByTagName('html')[0].addEventListener('mouseup',this.moseUpFn)
},
methods: {
mousedownFn:function (e) {
if(!this.confirmSuccess){
e.preventDefault && e.preventDefault() //阻止文字选中等 浏览器默认事件
this.mouseMoveStata = true
this.beginClientX = e.clientX
}
},
//mousedoen 事件
successFunction(){
this.confirmSuccess = true
this.confirmWords = '验证通过'
this.$emit('onValidation', true)
if(window.addEventListener){
document.getElementsByTagName('html')[0].removeEventListener('mousemove',this.mouseMoveFn)
document.getElementsByTagName('html')[0].removeEventListener('mouseup',this.moseUpFn)
}else document.getElementsByTagName('html')[0].removeEventListener('mouseup',()=>{})
document.getElementsByClassName('drag_text')[0].style.color = '#fff'
document.getElementsByClassName('handler')[0].style.left = this.maxwidth + 'px'
document.getElementsByClassName('drag_bg')[0].style.width = this.maxwidth + 'px'
},
//验证成功函数
mouseMoveFn(e){
if(this.mouseMoveStata){
let width = e.clientX - this.beginClientX
if(width > 0 && width <= this.maxwidth) {
document.getElementsByClassName('handler')[0].style.left = width + 'px'
document.getElementsByClassName('drag_bg')[0].style.width = width + 'px'
}else if(width > this.maxwidth) this.successFunction()
}
},
//mousemove事件
moseUpFn(e){
this.mouseMoveStata = false
var width = e.clientX - this.beginClientX
if(width<this.maxwidth){
document.getElementsByClassName('handler')[0].style.left = 0 + 'px'
document.getElementsByClassName('drag_bg')[0].style.width = 0 + 'px'
}
}
}
}
</script>
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览网页时往往会遇到类鼠标滑过图片时图片会进行缩放的效果，简单来说就是利用CSS3 中的2D转换的缩放加上一些简单的属性设置实现的，img:hover+scale实现鼠标到图片时的图片缩放，transition添加过渡效果，使图片的缩放更加自然，设置overflow:hidden，使图片放大后超出部分不再显示。
注：div宽高与img宽高均需设置，并且img图片需设置宽高与div盒子宽高相同。如果图片设置宽高小于div盒子的宽高，则会出现img盒子整体放大的效果，而不是只是图片本身的放大；若图片设置图片宽高大于div盒子的宽高，则会出现图片显示不完整的情况。具体代码及效果如下图所示：
利用hover+scale+transition实现图片放大代码示例
img宽高等于div宽高时的缩放效果图
img宽高小于div宽高时的缩放效果图
img宽高大于div宽高时的缩放效果图
仅以此作为学习笔记以及分享，如有需改进或者不妥之处，请多多指教。
1+0.01=1.01
1-0.01=0.99
片画廊组件是网站中常见的UI组件，尤其是在电商平台的产品详情页上，它允许用户通过缩略图快速浏览和查看产品的多个图片。本文介绍如何仅使用原生的js、css和html实现下面动画呈现的图片画廊组件。
首先创建HTML结构，包括主图区域和下方导航区域，需要重点交代的是id为spec-list的div元素是缩略图列表的容器，容器的position属性是relative，设置了固定的宽度，overflow设置为hidden，这样其子元素超过宽度的部分将不可见，它就相当于窗户，提供了一个矩形的的可见视野。ul装载所有的缩略图，它的position属性设置为absolute，这样就可以基于其父元素设置偏移量，它的宽度大于父元素的宽度，这样就通过设置left属性实现左右滑动，在父窗口范围内的缩略图将是可见的，这样就实现了滑动效果。
<div class="product-intro">
<div class="preview-wrap">
<div class="preview" id="preview">
<!-- 主图显示区域 -->
<div class="main-img" style="width: 460px; height: 460px;">
<img id="spec-img" alt="" src="./images/ai-generated-8833166_1280.webp"
style="width: 100%; height: 100%; object-fit: cover;">
</div>
<!-- 下方导航列表 -->
<div class="spec-list" style="width: 452px;">
<!-- 左侧箭头 -->
<a id="spec-forward" href="javascript：;" class="arrow-prev disabled">
<i class="sprite-arrow-prev">
<svg xmlns="http://www.w3.org/2000/svg" width="100%" height="100%" viewBox="0 0 24 24" style="scale:2;">
<path fill="currentColor" fill-rule="evenodd" d="m15 4l2 2l-6 6l6 6l-2 2l-8-8z"/>
</svg>
</i>
</a>
<!-- 右侧箭头 -->
<a id="spec-backward" href="javascript：;" class="arrow-next">
<i class="sprite-arrow-next">
<svg xmlns="http://www.w3.org/2000/svg" width="100%" height="100%" viewBox="0 0 24 24" style="scale:2;">
<path fill="currentColor" fill-rule="evenodd" d="m9.005 4l8 8l-8 8L7 18l6.005-6L7 6z"/>
</svg>
</i>
</a>
<!-- 缩略图列表可见区域 -->
<div id="spec-list" class="spec-items"
style="position: relative; width: 380px; height: 58px; overflow: hidden;">
<!-- 缩略图列表 -->
<ul class="lh" style="position: absolute; width: 456px; height: 58px; top: 0px; left: 0px;">
<li class="img-hover"><img alt="" src="./images/ai-generated-8833166_1280.webp" width="54" height="54"></li>
<li class=""><img alt="" src="./images/owl-50267_1280.jpg" width="54" height="54"></li>
<li class=""><img alt="" src="./images/seal-8834240_1280.webp" width="54" height="54"></li>
<li class=""><img alt="" src="./images/stork-8830107_1280.webp" width="54" height="54"></li>
<li class=""><img alt="" src="./images/triggerfish-8832563_1280.webp" width="54" height="54"></li>
<li class=""><img alt="" src="./images/ai-generated-8834126_1280.webp" width="54" height="54"></li>
</ul>
</div>
</div>
</div>
</div>
</div>
.product-intro {
position: relative;
z-index: 1;
margin-top: 10px;
padding-bottom: 10px
}
.product-intro .preview-wrap {
float: left;
padding-bottom: 15px;
position: relative;
zoom:1;
z-index: 7
}
.preview {
position: relative
}
.preview .main-img {
border: 1px solid #eee;
margin-bottom: 20px;
zoom: 1
}
.preview svg {
color: #CCCCCC;
}
.preview .spec-list {
margin-bottom: 18px;
position: relative;
zoom: 1
}
.preview .spec-list ul {
margin: 0;
transition: left 0.5s ease;
list-style-type: none;
padding-left: 0;
}
.preview .spec-list .arrow-next,.preview .spec-list .arrow-prev {
display: block;
width: 22px;
height: 32px;
float: left;
position: absolute;
cursor: pointer;
top: 50%;
margin-top: -16px
}
.preview .spec-list .arrow-next i,.preview .spec-list .arrow-prev i {
display: block
}
.preview .spec-list .arrow-prev {
left: 0
}
.preview .spec-list .arrow-prev:hover i svg {
color: #999999;
}
.preview .spec-list .arrow-prev.disabled i svg {
color: #DFDFDF;
}
.preview .spec-list .arrow-next {
right: 0
}
.preview .spec-list .arrow-next:hover i svg {
color: #999999;
}
.preview .spec-list .arrow-next.disabled i svg {
color: #DFDFDF;
}
.preview .spec-items {
width: 224px;
margin: 0 auto;
overflow: hidden
}
.preview .spec-items ul {
width: 2000px
}
.preview .spec-items ul li {
float: left;
margin: 0 9px;
max-width: 60px;
max-height: 70px
}
.preview .spec-items ul li img {
border: 2px solid #fff;
padding-bottom: 1px
}
.preview .spec-items ul li.img-hover img,.preview .spec-items ul li:hover img {
border: 2px solid #e53e41
}
.preview #spec-img {
max-height: 600px;
}
.preview .spec-list .spec-items {
width: 390px
}
js主要处理鼠标hover到缩略图更新主图区域图片的src属性值，以及缩略图的红色边框效果；以及实现左右侧箭头点击产生的缩略图列表左右滑动效果、箭头失效处理，注意js中是直接设置ul的left属性值，要实现滑动的动画效果，需要在css样式中设置transition属性为left 0.5s ease，否则就不会产生动画效果。
*请认真填写需求信息，我们会在24小时内与您取得联系。
