以下是效果图：实现了div盒子在固定区域的拖动，也可改变盒子的高度和宽度，当超出边距后无法继续改变大小

这里说一下大致原理：拖动和改变大小是分开来操作的，接下来分别说一下

盒子拖动

这里用到了js的三个鼠标事件，分别是onmousedown(鼠标按下)、onmousemove（鼠标移动）以及onmouseup(鼠标松开)，大致流程就是鼠标按下拖动图标进行拖动时，动态获取当前div的left和top再重新赋值给当前div的top、left值，当鼠标松开再清除事件，至于固定在某个区域内拖动，在赋值的时候判断当前top及left值是否超过限制区域的值，如果超过给最大值最小值

盒子改变大小

这里用到的也是盒子拖动的三个事件，当鼠标移入盒子左边框触发mousemove事件，动态计算盒子宽度重新赋值，鼠标松开注销mousrmove事件，我将宽度和高度改变分别封装了组件，用的时候直接调用就好

博主用的vue写的，这里展示的也是铜鼓vue书写的，其他都是大同小异，知道原理就好

// index.vue<template> <!-- demo --> <div class="demo" id="maxBoxId"> <div :id="moveInfo.dragId" :style=" 'width:' + moveInfo.width + 'px; left:' + moveInfo.coordinate.x + 'px; top:' + moveInfo.coordinate.y + 'px; height:' + moveInfo.height + 'px' " class="drag-class" > <div class="drag-content"> <div class="content-text"> <!-- 拖拽图标 --> <div class="drag-icon"> <i class="iconfont icon-tuodong1 down-dragger" @mousedown.stop="dragDiv($event)" @mouseup.stop="dragUp($event)" ></i> </div> {{ moveInfo.text }} </div> <!-- 宽度改变组件 --> <ChangeWidth :moveId="moveInfo.moveId" index="0" @widthChange="changeWidth" @clearEvent="clearEvent" /> <!-- 高度改变组件 --> <ChangeHeight :moveId="moveInfo.moveId" index="1" @heightChange="heightChange" @clearEvent="clearEvent" /> </div> </div> </div></template> <script>import ChangeWidth from '../component/ChangeWidth'import ChangeHeight from '../component/ChangeHeight'export default { components: { ChangeWidth, ChangeHeight }, name: 'demo', data() { return { moveInfo: { dragId: 'smallDragBoxId', moveId: 'smallMoveBoxId', text: '我是拖动的小盒子', width: 400, height: 100, // 上边距和左边距 coordinate: { x: 180, y: 10 } } } }, methods: { // 区块拖动 dragDiv(el, index) { // dragId: 可拖动区域唯一标识 // moveId: 改变宽度组件唯一标识 const { dragId, coordinate } = this.moveInfo let obig = document.getElementById('maxBoxId') let osmall = document.getElementById(dragId) // 用于保存小的div拖拽前的坐标 osmall.startX = el.clientX - osmall.offsetLeft osmall.startY = el.clientY - osmall.offsetTop document.onmousemove = e => { let left, top left = e.clientX - osmall.startX top = e.clientY - osmall.startY osmall.style.left = left + 'px' osmall.style.top = top + 'px' coordinate.x = left coordinate.y = top if (left <= 0) { osmall.style.left = 0 + 'px' coordinate.x = 0 } if (top <= 0) { osmall.style.top = 0 + 'px' coordinate.y = 0 } if (left >= obig.offsetWidth - osmall.offsetWidth) { osmall.style.left = obig.offsetWidth - osmall.offsetWidth + 'px' coordinate.x = obig.offsetWidth - osmall.offsetWidth } if (top >= obig.offsetHeight - osmall.offsetHeight) { osmall.style.top = obig.offsetHeight - osmall.offsetHeight + 'px' coordinate.y = obig.offsetHeight - osmall.offsetHeight } } }, dragUp(el) { document.onmousemove = null document.onmouseup = null // 调用接口保存数据 }, // 改变drag宽度尺寸 changeWidth(params) { const { index, width } = params let left const { dragId } = this.moveInfo // let obig = document.getElementById('maxBoxId') let osmall = document.getElementById(dragId) let boxWidth = document.getElementById('maxBoxId').offsetWidth left = osmall.style.left const newWidth = this.moveInfo.width + width // outWidth拖动宽度时超出box的宽度 const outWidth = Number(left.slice(0, left.length - 2)) + Number(newWidth) - Number(boxWidth) // 如果超出box将截取留下的 if (outWidth >= 0) { this.moveInfo.width = Number(boxWidth) - Number(left.slice(0, left.length - 2)) } else { this.moveInfo.width = newWidth } // 设置div的最小宽度和最大宽度 if (this.moveInfo.width < 200) { this.moveInfo.width = 200 } if (this.moveInfo.width > 900) { this.moveInfo.width = 900 } }, // 改变drag高度 heightChange(params) { const { index, height } = params let top let osmall = document.getElementById(this.moveInfo.dragId) let boxHeight = document.getElementById('maxBoxId').offsetHeight top = osmall.style.top const newHeight = this.moveInfo.height + height // outHeight拖动宽度时超出box的高度 const outHeight = Number(top.slice(0, top.length - 2)) + Number(newHeight) - Number(boxHeight) // 如果超出box将截取留下的 if (outHeight >= 0) { this.moveInfo.height = Number(boxHeight) - Number(top.slice(0, top.length - 2)) } else { this.moveInfo.height = newHeight } // 设置div的最小宽度和最大宽度 if (this.moveInfo.height < 100) { this.moveInfo.height = 100 } if (this.moveInfo.height > 200) { this.moveInfo.height = 200 } }, // 清除鼠标事件 clearEvent() { document.onmousemove = null document.onmouseup = null } }}</script><style lang="scss" scoped>.demo { position: relative; width: 100%; z-index: 10; width: 1200px; background: red; height: 300px; margin-bottom: 1000px; margin-left: 100px; .drag-class { background: rgba(255, 255, 255, 0); position: absolute; .drag-content { position: relative; height: 100%; .content-text { border: 1px dashed #ffffff; font-size: 34px; color: #ffffff; margin-top: 5px; position: relative; height: 100%; .drag-icon { position: absolute; right: 10px; top: 5px; float: left; // margin-right: 10px; .down-dragger { cursor: move; font-size: 30px; color: #dbdce0; color: #ffffff; } } } } }}</style>

以下是改变大小的组件

<template> <!-- 拖动右边距改变div宽度 --> <div :id="`width${moveId}`" class="x-handle" @mousedown="mouseDown"></div></template> <script>export default { name: 'ChangeWidth', props: ['index', 'moveId'], data() { return { lastX: '' } }, created() { document.addEventListener('mouseup', this.mouseUp) }, destroyed() { document.removeEventListener('mouseup', this.mouseUp) }, methods: { mouseDown(event) { document.addEventListener('mousemove', this.mouseMove) this.lastX = event.screenX }, mouseMove(e) { this.$emit('widthChange', { width: e.screenX - this.lastX, index: this.index }) this.lastX = e.screenX }, mouseUp() { this.lastX = '' document.removeEventListener('mousemove', this.mouseMove) this.$emit('clearEvent') } }}</script><style lang="less" scoped>.x-handle { width: 5px; cursor: e-resize; background: #2866f0; height: 30px; position: absolute; right: 0; top: 40%;}</style>

改变高度的组件原理和宽度一样，避免代码重复就不上传了

上面就是大致流程和源码。

总结

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