<template><div class="tools"><ul @mouseleave="mouseLeave()"><li @click="toTop(step)">回到頂部</li><li @mouseover="mouseOver(1)">QQ</li><li @mouseover="mouseOver(2)">微信</li></ul><div v-if="showIndex === 1">玩QQ</div><div v-if="showIndex === 2">玩微信</div></div></template>

<script>export default { name: 'FloatTools', props: { step: { //此數據是控制動畫快慢的  type: Number,  default: 50 } }, data() { return {  isActive: false,  showIndex:0//默認顯示下標 } }, methods: { toTop(i) {  //參數i表示間隔的幅度大小，以此來控制速度   document.documentElement.scrollTop -= i;  if (document.documentElement.scrollTop > 0) {  var c = setTimeout(() => this.toTop(i), 16);  } else {  clearTimeout(c);  } }, handleScroll() {  //獲取滾動距頂部的距離，顯示  let scrollTop = window.pageYOffset || document.documentElement.scrollTop || document.body.scrollTop；  if (scrollTop > 60) {  this.isActive = true;  } else {  this.isActive = false;  } }, mouseOver(index) { //鼠標移到哪個工具上，對應內容顯示出來  this.showIndex = index; }, mouseLeave(){ //鼠標移出工具區域后1秒，內容區域消失   let timer = setTimeout(() => {   this.showIndex = 0;   clearTimeout(timer)  }, 500); } }, mounted: function () { window.addEventListener('scroll', this.handleScroll, true); // 監聽（綁定）滾輪滾動事件 }, destroyed() { window.removeEventListener('scroll', this.handleScroll); //離開頁面需要移除這個監聽的事件 }}</script>