vue指令之气泡提示效果的实现代码

import { on , off , once, contains, elemOffset, position, addClass, removeClass } from '../utils/dom';
import Vue from 'vue'
const global = window;
const doc = global.document;
const top = 15;
export default {
 name : 'jc-tips' ,
 bind (el , binding , vnode) {
  // 确定el 已经在页面里 为了获取el 位置信信 
  Vue.nextTick(() => {
   const { context } = vnode;
   const { expression } = binding;
   // 气泡元素根结点
   const fWarpElm = doc.createElement('div');
   // handleFn 气泡里的子元素（自定义）
   const handleFn = binding.expression && context[expression] || (() => '');
   const createElm = handleFn();
   fWarpElm.className = 'hide jc-tips-warp';
   fWarpElm.appendChild(createElm);
   doc.body.appendChild(fWarpElm);
   // 给el 绑定元素待其他操作用
   el._tipElm = fWarpElm;
   el._createElm = createElm;
   // 鼠标放上去的 回调函数
   el._tip_hover_fn = function(e) {
    // 删除节点函数
     removeClass(fWarpElm, 'hide');
     fWarpElm.style.opacity = 0;
     // 不加延迟 fWarpElm的大小信息 （元素大小是 0 0）---> 删除 class 不是立即渲染
     setTimeout(() => {
      const offset = elemOffset(fWarpElm);
      const location = position(el);
      fWarpElm.style.cssText = `left: ${location.left - offset.width / 2}px; top: ${location.top - top - offset.height}px;`;
      fWarpElm.style.opacity = 1;
     }, 16);
   };
   //鼠标离开 元素 隐藏 气泡
   const handleLeave = function (e) {
    fWarpElm.style.opacity = 0;
    // transitionEnd 不太好应该加入兼容
    once({
     el,
     type: 'transitionEnd',
     fn: function() {
      console.log('hide');
      addClass(fWarpElm, 'hide');
     }
    })
   };
   el._tip_leave_fn = handleLeave;
   // 解决 slider 移动结束 提示不消失
   el._tip_mouse_up_fn = function (e) {
    const target = e.target;
    console.log(target);
    if (!contains(fWarpElm, target) && el !== target) {
     handleLeave(e)
    }
   };
   on({
    el,
    type: 'mouseenter',
    fn: el._tip_hover_fn
   });
   on({
    el,
    type: 'mouseleave',
    fn: el._tip_leave_fn
   });
   on({
    el: doc.body,
    type: 'mouseup',
    fn: el._tip_mouse_up_fn
   })
  });
 } ,
 // 气泡的数据变化 依赖于 context[expression] 返回的值
 componentUpdated(el , binding , vnode) {
  const { context } = vnode;
  const { expression } = binding;
  const handleFn = expression && context[expression] || (() => '');
  Vue.nextTick( () => {
   const createNode = handleFn();
   const fWarpElm = el._tipElm;
   if (fWarpElm) {
    fWarpElm.replaceChild(createNode, el._createElm);
    el._createElm = createNode;
    const offset = elemOffset(fWarpElm);
    const location = position(el);
    fWarpElm.style.cssText = `left: ${location.left - offset.width / 2}px; top: ${location.top - top - offset.height}px;`;
   }
  })
 },
 // 删除 事件
 unbind (el , bind , vnode) {
  off({
   el: dov.body,
   type: 'mouseup',
   fn: el._tip_mouse_up_fn
  });
  el = null;
 }
}

../utils/dom
const global = window;
export const on = ({el, type, fn}) => {
     if (typeof global) {
       if (global.addEventListener) {
         el.addEventListener(type, fn, false)
      } else {
         el.attachEvent(`on${type}`, fn)
      }
     }
  };
  export const off = ({el, type, fn}) => {
    if (typeof global) {
      if (global.removeEventListener) {
        el.removeEventListener(type, fn)
      } else {
        el.detachEvent(`on${type}`, fn)
      }
    }
  };
  export const Once= ({el, type, fn}) => {
    const hyFn = (event) => {
      try {
        fn(event)
      }
       finally {
        off({el, type, fn: hyFn})
      }
    }
    on({el, type, fn: hyFn})
  };
  // 最后一个
  export const fbTwice = ({fn, time = 300}) => {
    let [cTime, k] = [null, null]
    // 获取当前时间
    const getTime = () => new Date().getTime()
    // 混合函数
    const hyFn = () => {
      const ags = argments
      return () => {
        clearTimeout(k)
        k = cTime = null
        fn(...ags)
      }
    };
    return () => {
      if (cTime == null) {
        k = setTimeout(hyFn(...arguments), time)
        cTime = getTime()
      } else {
        if ( getTime() - cTime <0) {
          // 清除之前的函数堆 ---- 重新记录
          clearTimeout(k)
          k = null
          cTime = getTime()
          k = setTimeout(hyFn(...arguments), time)
        }
      }}
  };
  export const cOntains= function(parentNode, childNode) {
    if (parentNode.contains) {
      return parentNode !== childNode && parentNode.contains(childNode)
    } else {
      // https://developer.mozilla.org/zh-CN/docs/Web/API/Node/compareDocumentPosition
      return (parentNode.compareDocumentPosition(childNode) === 16)
    }
  };
  export const addClass = function (el, className) {
    if (typeof el !== "object") {
      return null
    }
    let classList = el['className']
    classList = classList === '' &＃63; [] : classList.split(/\s+/)
    if (classList.indexOf(className) === -1) {
      classList.push(className)
      el.className = classList.join(' ')
    }
  };
  export const removeClass = function (el, className) {
    let classList = el['className']
    classList = classList === '' &＃63; [] : classList.split(/\s+/)
    classList = classList.filter(item => {
      return item !== className
    })
    el.className =   classList.join(' ')
  };
  export const delay = ({fn, time}) => {
    let oT = null
    let k = null
    return () => {
      // 当前时间
      let cT = new Date().getTime()
      const fixFn = () => {
        k = oT = null
        fn()
      }
      if (k === null) {
        oT = cT
        k = setTimeout(fixFn, time)
        return
      }
      if (cT - oT  {
    let top = 0;
    let left = 0;
    let offsetParent = son;
    while (offsetParent !== parent) {
      let dx = offsetParent.offsetLeft;
      let dy = offsetParent.offsetTop;
      let old = offsetParent;
      if (dx === null) {
        return {
          flag: false
        }
      }
      left += dx;
      top += dy;
   offsetParent = offsetParent.offsetParent;
      if (offsetParent === null && old !== global.document.body) {
        return {
          flag: false
        }
      }
    }
    return {
      flag: true,
      top,
      left
    }
  };
  export const getElem = (filter) => {
    return Array.from(global.document.querySelectorAll(filter));
  };
  export const elemOffset = (elem) => {
    return {
      width: elem.offsetWidth,
      height: elem.offsetHeight
    }
  };