beforeRouteLeave(to,from,next){
///关键语句
let top= document.documentElement.scrollTop || document.body.scrollTop || window.pageYOffset;
this.rememberOffsetTop =top|| 0
next();
},
activated(){
this.$nextTick(()=>{
document.documentElement.scrollTop = Number(this.rememberOffsetTop);
})
}
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