<template> <!-- 放大镜 --> <div style="display: flex;position: relative"> <div class="box Magnifying" :style="minImgBoxStyle" @mouseleave="mouseLeave" @mouseenter="mouseEnter" @mousemove="mousemove($event)" > <!-- <div>{{title}}</div> --> <!--原始照片-小照片 :src="finalMinIMGsrc"--> <img ref="minImg" :style="minImgStyle" fit="contain" :src="imageurl"> <!--探测块--> <div v-show="show" class="areaMark" :style="areaMarkStyle" /> </div> <div v-show="show" class="box maxImgBox" :style="maxImgBoxStyle"> <!--放大后的照片--> <img :style="maxImgStyle" fit="contain" :src="imageurl"> </div> </div> </template> <script> export default { name: 'Magnifying', props: { imageurl: {}, imgsurl: {}, // 父组件图片 // imageurl: '', minIMGsrc: String, maxIMGsrc: String, scale: { type: Number, default: 2 }, width: { type: Number, default: 380 }, height: { type: Number, default: 380 } }, data() { return { show: false, finalMinIMGsrc: '', finalMaxIMGsrc: '', imgBoxWidth: 380, imgBoxHeight: 380, areaWidth: 210, areaHeight: 210, areaMarkStyle: {}, minImgBoxStyle: { cursor: 'move' }, minImgStyle: {}, maxImgBoxStyle: {}, maxImgStyle: { position: 'absolute' } } }, watch: { imgsurl: function(newVal, oldVal) { this.finalMinIMGsrc = newVal // 监听父组件图片 改变组件内图片地址 console.log(newVal) }, minIMGsrc() { this.init() }, maxIMGsrc() { this.init() } }, mounted() { this.init() }, methods: { init() { this.imgBoxWidth = this.width this.imgBoxHeight = this.height this.$set(this.minImgStyle, 'width', this.imgBoxWidth + 'px') this.$set(this.minImgStyle, 'height', this.imgBoxHeight + 'px') this.$set(this.maxImgStyle, 'width', this.imgBoxWidth + 'px') this.$set(this.maxImgStyle, 'height', this.imgBoxHeight + 'px') this.$set(this.minImgBoxStyle, 'width', this.imgBoxWidth + 'px') this.$set(this.minImgBoxStyle, 'height', this.imgBoxHeight + 'px') this.$set(this.maxImgBoxStyle, 'width', this.imgBoxWidth + 'px') this.$set(this.maxImgBoxStyle, 'height', this.imgBoxHeight + 'px') this.$set(this.maxImgBoxStyle, 'left', this.imgBoxWidth + 'px') this.areaWidth = this.imgBoxWidth / this.scale this.areaHeight = this.imgBoxHeight / this.scale this.finalMinIMGsrc = this.minIMGsrc if (!this.maxIMGsrc) { this.finalMaxIMGsrc = this.minIMGsrc } this.$set(this.areaMarkStyle, 'width', this.areaWidth + 'px') this.$set(this.areaMarkStyle, 'height', this.areaHeight + 'px') this.$set(this.maxImgStyle, 'transform', 'scale(' + this.scale + ')') }, mouseEnter() { this.show = true }, mouseLeave() { this.show = false }, mousemove(e) { // 获取文档顶端与屏幕顶部之间的距离 // scrollTop指的是“元素中的内容”超出“元素上边界”的那部分的高度 const documentScrollTop = document.documentElement.scrollTop || document.body.scrollTop // 获取鼠标相对于屏幕的坐标 const mouseClientX = e.clientX const mouseClientY = e.clientY // 获取小照片相对于屏幕位置信息 // getBoundingClientRect()用于获得页面中某个元素的左,上,右和下分别相对浏览器视窗的位置。 const minImgPosition = this.$refs.minImg.getBoundingClientRect() const minImgX = minImgPosition.left const minImgY = minImgPosition.top // 计算出探测块相对于小图片的坐标 let areaLeft = mouseClientX - minImgX - this.areaWidth / 2 let areaTop = mouseClientY - minImgY - this.areaHeight / 2 if (documentScrollTop > 0) { areaTop = documentScrollTop + areaTop } const minLeft = 0 const maxLeft = this.imgBoxWidth - this.areaWidth const minTop = 0 const maxTop = this.imgBoxHeight - this.areaHeight // 禁止探测块移出小图片 if (areaLeft < minLeft) { areaLeft = minLeft } if (areaLeft > maxLeft) { areaLeft = maxLeft } if (areaTop < minTop) { areaTop = minTop } if (areaTop > maxTop) { areaTop = maxTop } // 更新探测块的坐标 this.$set(this.areaMarkStyle, 'left', areaLeft + 'px') this.$set(this.areaMarkStyle, 'top', areaTop + 'px') // 更新放大后照片的坐标 this.$set( this.maxImgStyle, 'left', ((this.scale - 1) * this.imgBoxWidth) / 2 - areaLeft * this.scale + 'px' ) this.$set( this.maxImgStyle, 'top', ((this.scale - 1) * this.imgBoxHeight) / 2 - areaTop * this.scale + 'px' ) } } } </script> <style scoped> .Magnifying { height: 380px; width: 380px; } .box { border: 1px solid darkgray; position: relative; overflow: hidden; box-sizing: border-box; } .areaMark { position: absolute; background: url(//img-tmdetail.alicdn.com/tps/i4/T12pdtXaldXXXXXXXX-2-2.png); } .maxImgBox { position: absolute; z-index: 999; } </style>