vue项目回到顶部的两种超简单实现方法

<template>
	<div id="topAnchor" ref="faultTree" class="wrap">
	    <a id="TOPUp" href="#topAnchor" rel="external nofollow" >
	      <img style="width: 100%;height: 100%;" src="../../../../assets/top.png" alt="">
	    </a>
	    <!--其他业务逻辑代码-->
	    ...
	</div>
</template>

<style>
#TOPUp{
  position: fixed;
  right: 45px;
  bottom: 100px;
  width: 40px;
  height: 40px;
  z-index: 99999999;
  box-shadow: 0px 0px 4px 4px #ecefef;
  border-radius: 600px;
}
</style>

<template>
  <div class="hello_world">
    <button class="top" @click="toTop">^</button>
  </div>
</template>
<script>
export default {
  methods: {
    toTop() {
      document.documentElement.scrollTop = 0;
    },
  },
};
</script>
<style>
.hello_world {
  height: 5000px;
}
.top {
    position: fixed;
    width: 30px;
    height: 30px;
    bottom: 50px;
    right: 100px;
    background-color: aqua;
  }
</style>

const router = createRouter({
  history: createWebHashHistory(),
  routes: [...],
  scrollBehavior (to, from, savedPosition) {
    // return 期望滚动到哪个的位置
    // vue2.0  x  y  控制
    // vue3.0  left  top 控制
	return { left: 0, top: 0 }  }
})

router.afterEach((to,from,next)=>{
    window.scrollTo(0,0);
})