<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(shù)據(jù)是控制動(dòng)畫快慢的  type: Number,  default: 50 } }, data() { return {  isActive: false,  showIndex:0//默認(rèn)顯示下標(biāo) } }, methods: { toTop(i) {  //參數(shù)i表示間隔的幅度大小，以此來(lái)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(dòng)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(biāo)移到哪個(gè)工具上，對(duì)應(yīng)內(nèi)容顯示出來(lái)  this.showIndex = index; }, mouseLeave(){ //鼠標(biāo)移出工具區(qū)域后1秒，內(nèi)容區(qū)域消失   let timer = setTimeout(() => {   this.showIndex = 0;   clearTimeout(timer)  }, 500); } }, mounted: function () { window.addEventListener('scroll', this.handleScroll, true); // 監(jiān)聽（綁定）滾輪滾動(dòng)事件 }, destroyed() { window.removeEventListener('scroll', this.handleScroll); //離開頁(yè)面需要移除這個(gè)監(jiān)聽的事件 }}</script>