原作者地址：https://github.com/lemontree2000/vue-magnify
经测试，原插件在使用时有bug,即在预览时进行鼠标滚动，导致遮罩层计算错误。我已修复该bug,特分享出来。
组件核心代码：
<template>
<div class="magnify">
<div class="preview-box" @mousemove="move($event)" @mouseout="out" ref="previewBox">
<img width="100%" :src="previewImg" alt="">
<div class="hover-box" ref="hoverBox"></div>
</div>
<div class="zoom-box" v-show="zoomVisiable" ref="zoomBox">
<img :src="zoomImg" alt="" ref="bigImg">
</div>
</div>
</template>
<script>
function offset(el) {
let top = el.offsetTop;
let left = el.offsetLeft;
while (el.offsetParent) {
el = el.offsetParent;
top += el.offsetTop;
left += el.offsetLeft;
}
return {
left: left,
top: top
}
}
export default {
name: \'magnify\',
props: {
previewImg: {
type: String,
default: \'\'
},
zoomImg: {
type: String,
default: \'\'
}
},
data() {
return {
zoomVisiable: false,
hoverVisiable: false
};
},
methods: {
out() {
this.zoomVisiable = false;
},
move(ev) {
this.init();
// 鼠标距离屏幕距离
let moveX = ev.clientX;
let moveY = ev.clientY;
// 大盒子距离顶部的距离
let offsetLeft = offset(this.oPreviewBox).left;
let offsetTop = offset(this.oPreviewBox).top;
let left = moveX - offsetLeft - this.houverWidth / 2;
let top
if(this.scroll > 0) {
top = moveY - offsetTop + this.scroll - this.houverHeight / 2;
}else {
top = moveY - offsetTop - this.houverHeight / 2;
}
let maxWidth = this.pWidth - this.houverWidth;
let maxHeight = this.pWidth - this.houverHeight;
left = left < 0 ? 0 : left > maxWidth ? maxWidth : left;
top = top < 0 ? 0 : top > maxHeight ? maxHeight : top;
let percentX = left / (maxWidth);
let percentY = top / (maxHeight);
this.oHoverBox.style.left = left + \'px\';
this.oHoverBox.style.top = top + \'px\';
this.oBigImg.style.left = percentX * (this.bWidth - this.imgWidth) + \'px\';
this.oBigImg.style.top = percentY * (this.bHeight - this.imgHeight) + \'px\';
this.$emit(\'move\', ev);
this.zoomVisiable = true;
},
init() {
this.oHoverBox = this.$refs.hoverBox;
this.oPreviewBox = this.$refs.previewBox;
this.oBigImg = this.$refs.bigImg;
this.imgBox = this.$refs.zoomBox;
this.houverWidth = this.oHoverBox.offsetWidth;
this.houverHeight = this.oHoverBox.offsetHeight;
this.pWidth = this.oPreviewBox.offsetWidth;
this.pHeight = this.oPreviewBox.offsetHeight;
this.imgWidth = this.oBigImg.offsetWidth;
this.imgHeight = this.oBigImg.offsetHeight;
this.bWidth = this.imgBox.offsetWidth;
this.bHeight = this.imgBox.offsetHeight;
this.scroll = document.documentElement.scrollTop || document.body.scrollTop;
}
}
};
</script>
<!-- Add "scoped" attribute to limit CSS to this component only -->
<style lang="scss" scoped>
.magnify {
position: relative;
.preview-box {
width: 480px;
height: 480px;
border: 1px solid #dededd;
position: relative;
&:hover .hover-box{
display: block;
}
.hover-box {
position: absolute;
display: none;
left: 0;
top: 0;
width: 100px;
height: 100px;
border: 1px solid #545454;
background: url(\'https://img-tmdetail.alicdn.com/tps/i4/T12pdtXaldXXXXXXXX-2-2.png\') repeat 0 0;
cursor: move;
user-select: none;
}
}
.zoom-box {
width: 480px;
height: 480px;
overflow: hidden;
position: absolute;
left: 485px;
border: 1px solid #dc7a7a;;
top: 0;
img {
position: absolute;
top: 0;
left: 0;
}
}
}
</style>
使用：
<template>
<div>
<my-magnify :previewImg="data.min" :zoomImg="data.max"></my-magnify>
</div>
</template>
<script>
import MyMagnify from "~/components/Magnify.vue";
export default {
data() {
return {
data: {
min:
"https://img.alicdn.com/imgextra/i3/2857774462/TB21fgcwwNlpuFjy0FfXXX3CpXa_!!2857774462.jpg_430x430q90.jpg",
max:
"https://img.alicdn.com/imgextra/i3/2857774462/TB21fgcwwNlpuFjy0FfXXX3CpXa_!!2857774462.jpg"
}
};
},
components: {
MyMagnify
}
}
</script>
效果图：
