1.编写一个util.js
import Vue from "vue" Vue.directive('dialogDrag', { bind(el, binding, vnode, oldVnode) { //弹框可拉伸最小宽高 let minWidth = 400; let minHeight = 300; //初始非全屏 let isFullScreen = false; //当前宽高 let nowWidth = 0; let nowHight = 0; //当前顶部高度 let nowMarginTop = 0; //获取弹框头部（这部分可双击全屏） const dialogHeaderEl = el.querySelector('.el-dialog__header'); //弹窗 const dragDom = el.querySelector('.el-dialog'); //给弹窗加上overflow auto；不然缩小时框内的标签可能超出dialog； dragDom.style.overflow = "auto"; //清除选择头部文字效果 //dialogHeaderEl.onselectstart = new Function("return false"); //头部加上可拖动cursor dialogHeaderEl.style.cursor = 'move'; // 获取原有属性 ie dom元素.currentStyle 火狐谷歌 window.getComputedStyle(dom元素, null); const sty = dragDom.currentStyle || window.getComputedStyle(dragDom, null); let moveDown = (e) => { // 鼠标按下，计算当前元素距离可视区的距离 const disX = e.clientX - dialogHeaderEl.offsetLeft; const disY = e.clientY - dialogHeaderEl.offsetTop; // 获取到的值带px 正则匹配替换 let styL, styT; // 注意在ie中 第一次获取到的值为组件自带50% 移动之后赋值为px if (sty.left.includes('%')) { styL = +document.body.clientWidth * (+sty.left.replace(/\%/g, '') / 100); styT = +document.body.clientHeight * (+sty.top.replace(/\%/g, '') / 100); } else { styL = +sty.left.replace(/\px/g, ''); styT = +sty.top.replace(/\px/g, ''); }; document.onmousemove = function (e) { // 通过事件委托，计算移动的距离 const l = e.clientX - disX; const t = e.clientY - disY; // 移动当前元素 dragDom.style.left = `${l + styL}px`; dragDom.style.top = `${t + styT}px`; //将此时的位置传出去 //binding.value({x:e.pageX,y:e.pageY}) }; document.onmouseup = function (e) { document.onmousemove = null; document.onmouseup = null; }; } dialogHeaderEl.onmousedown = moveDown; //双击头部全屏效果 dialogHeaderEl.ondblclick = (e) => { if (isFullScreen == false) { nowHight = dragDom.clientHeight; nowWidth = dragDom.clientWidth; nowMarginTop = dragDom.style.marginTop; dragDom.style.left = 0; dragDom.style.top = 0; dragDom.style.height = "100VH"; dragDom.style.width = "100VW"; dragDom.style.marginTop = 0; isFullScreen = true; dialogHeaderEl.style.cursor = 'initial'; dialogHeaderEl.onmousedown = null; } else { dragDom.style.height = "auto"; dragDom.style.width = nowWidth + 'px'; dragDom.style.marginTop = nowMarginTop; isFullScreen = false; dialogHeaderEl.style.cursor = 'move'; dialogHeaderEl.onmousedown = moveDown; } } dragDom.onmousemove = function (e) { let moveE = e; if (e.clientX > dragDom.offsetLeft + dragDom.clientWidth - 10 || dragDom.offsetLeft + 10 > e.clientX) { dragDom.style.cursor = 'w-resize'; } else if (el.scrollTop + e.clientY > dragDom.offsetTop + dragDom.clientHeight - 10) { dragDom.style.cursor = 's-resize'; } else { dragDom.style.cursor = 'default'; dragDom.onmousedown = null; } dragDom.onmousedown = (e) => { const clientX = e.clientX; const clientY = e.clientY; let elW = dragDom.clientWidth; let elH = dragDom.clientHeight; let EloffsetLeft = dragDom.offsetLeft; let EloffsetTop = dragDom.offsetTop; dragDom.style.userSelect = 'none'; let ELscrollTop = el.scrollTop; //判断点击的位置是不是为头部 if (clientX > EloffsetLeft && clientX < EloffsetLeft + elW && clientY > EloffsetTop && clientY < EloffsetTop + 100) { //如果是头部在此就不做任何动作，以上有绑定dialogHeaderEl.onmousedown = moveDown; } else { document.onmousemove = function (e) { e.preventDefault(); // 移动时禁用默认事件 //左侧鼠标拖拽位置 if (clientX > EloffsetLeft && clientX < EloffsetLeft + 10) { //往左拖拽 if (clientX > e.clientX) { dragDom.style.width = elW + (clientX - e.clientX) * 2 + 'px'; } //往右拖拽 if (clientX < e.clientX) { if (dragDom.clientWidth < minWidth) { } else { dragDom.style.width = elW - (e.clientX - clientX) * 2 + 'px'; } } } //右侧鼠标拖拽位置 if (clientX > EloffsetLeft + elW - 10 && clientX < EloffsetLeft + elW) { //往左拖拽 if (clientX > e.clientX) { if (dragDom.clientWidth < minWidth) { } else { dragDom.style.width = elW - (clientX - e.clientX) * 2 + 'px'; } } //往右拖拽 if (clientX < e.clientX) { dragDom.style.width = elW + (e.clientX - clientX) * 2 + 'px'; } } //底部鼠标拖拽位置 if (ELscrollTop + clientY > EloffsetTop + elH - 20 && ELscrollTop + clientY < EloffsetTop + elH) { //往上拖拽 if (clientY > e.clientY) { if (dragDom.clientHeight < minHeight) { } else { dragDom.style.height = elH - (clientY - e.clientY) * 2 + 'px'; } } //往下拖拽 if (clientY < e.clientY) { dragDom.style.height = elH + (e.clientY - clientY) * 2 + 'px'; } } }; //拉伸结束 document.onmouseup = function (e) { document.onmousemove = null; document.onmouseup = null; }; } } } }})
2.在main.js中引用
import "../libs/utils"
3.在el-dialog组件中使用
<el-button type="text" @click="dialogVisible = true" v-dialogDrag>点击打开 Dialog</el-button>