1、应用网上el-dialog的拖拽拉宽指令，存在如下问题
1.1应用指令后el-table的头部的可伸缩时的鼠标款式会隐没1.2应用指令后el-dialog的内容不能文本复制了（这个影响最大）
2、解决办法：通过自己钻研，特定组合了指令方~~~~法完满地解决了el-dialog的拖拽，双击头部放大，拉宽拉低等性能，而且没有后遗症（el-dialog的内容不能文本复制，el-table的头部拉宽时的鼠标款式会显示问题）
/* * 定义公共js里，在入口文件main.js中import； * 给elementUI的dialog上加上 v-dialogDrag 指令就能够实现弹窗的全屏和拉伸了。 */// v-dialogDrag: 弹窗拖拽+程度方向伸缩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; //以后宽高 let nowWidth = 0; let nowHight = 0; //以后顶部高度 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；不然放大时框内的标签可能超出dialog； dragDom.style.overflow = "auto"; //革除抉择头部文字效果 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，计算以后元素间隔可视区的间隔 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; // 留神在ie中 第一次获取到的值为组件自带50% 挪动之后赋值为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，计算挪动的间隔 const l = e.clientX - disX; const t = e.clientY - disY; // 挪动以后元素 dragDom.style.left = `${l + styL}px`; dragDom.style.top = `${t + styT}px`; //将此时的地位传出去 //binding.value({x:e.pageX,y:e.pageY}) }; document.onmouseup = function (e) { document.onmousemove = null; document.onmouseup = null; }; } dialogHeaderEl.onmousedown = moveDown; //双击头部成果 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; } } //拉伸(右下方) let resizeEl=document.createElement("div"); dragDom.appendChild(resizeEl); //在弹窗右下角加上一个10-10px的管制块 resizeEl.style.cursor = 'se-resize'; resizeEl.style.position = 'absolute'; resizeEl.style.height = '10px'; resizeEl.style.width = '10px'; resizeEl.style.right = '0px'; resizeEl.style.bottom = '0px'; resizeEl.style.zIndex = '99'; //鼠标拉伸弹窗 resizeEl.onmousedown = (e) => { // 记录初始x地位 let clientX = e.clientX; // 鼠标按下，计算以后元素间隔可视区的间隔 let disX = e.clientX - resizeEl.offsetLeft; let disY = e.clientY - resizeEl.offsetTop; document.onmousemove = function (e) { e.preventDefault(); // 挪动时禁用默认事件 // 通过事件委托，计算挪动的间隔 let x = e.clientX - disX + (e.clientX - clientX);//这里 因为elementUI的dialog管制居中的，所以程度拉伸成果是双倍 let y = e.clientY - disY; //比拟是否小于最小宽高 dragDom.style.width = x > minWidth ? `${x}px` : minWidth + 'px'; dragDom.style.height = y > minHeight ? `${y}px` : minHeight + 'px'; }; //拉伸完结 document.onmouseup = function (e) { document.onmousemove = null; document.onmouseup = null; }; } //拉伸(左边) let resizeElR=document.createElement("div"); dragDom.appendChild(resizeElR); //在弹窗右下角加上一个10-10px的管制块 resizeElR.style.cursor = 'w-resize'; resizeElR.style.position = 'absolute'; resizeElR.style.height = '100%'; resizeElR.style.width = '10px'; resizeElR.style.right = '0px'; resizeElR.style.top = '0px'; //鼠标拉伸弹窗 resizeElR.onmousedown = (e) => { let elW = dragDom.clientWidth; let EloffsetLeft = dragDom.offsetLeft; // 记录初始x地位 let clientX = e.clientX; document.onmousemove = function (e) { e.preventDefault(); // 挪动时禁用默认事件 //右侧鼠标拖拽地位 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'; } } }; //拉伸完结 document.onmouseup = function (e) { document.onmousemove = null; document.onmouseup = null; }; } //拉伸(右边) let resizeElL=document.createElement("div"); dragDom.appendChild(resizeElL); //在弹窗右下角加上一个10-10px的管制块 resizeElL.style.cursor = 'w-resize'; resizeElL.style.position = 'absolute'; resizeElL.style.height = '100%'; resizeElL.style.width = '10px'; resizeElL.style.left = '0px'; resizeElL.style.top = '0px'; //鼠标拉伸弹窗 resizeElL.onmousedown = (e) => { let elW = dragDom.clientWidth; let EloffsetLeft = dragDom.offsetLeft; // 记录初始x地位 let clientX = e.clientX; document.onmousemove = function (e) { e.preventDefault(); // 挪动时禁用默认事件 //左侧鼠标拖拽地位 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'; } } } }; //拉伸完结 document.onmouseup = function (e) { document.onmousemove = null; document.onmouseup = null; }; } // 拉伸(下边) let resizeElB=document.createElement("div"); dragDom.appendChild(resizeElB); //在弹窗右下角加上一个10-10px的管制块 resizeElB.style.cursor = 'n-resize'; resizeElB.style.position = 'absolute'; resizeElB.style.height = '10px'; resizeElB.style.width = '100%'; resizeElB.style.left = '0px'; resizeElB.style.bottom = '0px'; //鼠标拉伸弹窗 resizeElB.onmousedown = (e) => { let EloffsetTop = dragDom.offsetTop; let ELscrollTop = el.scrollTop; let clientY = e.clientY; let elH = dragDom.clientHeight; document.onmousemove = function (e) { e.preventDefault(); // 挪动时禁用默认事件 //底部鼠标拖拽地位 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'; } } }; //拉伸完结 document.onmouseup = function (e) { document.onmousemove = null; document.onmouseup = null; }; } }})/** * 留神：如果是el-dialog弹出的表单el-form，最好不要把提交按钮当做el-form-item（elementUI文档是这么用的），放在el-dialog里。 * 不然按钮会同el-dialog中标签一样被overflow；*/