Vue中在组件销毁时清除定时器

在mounted中创建并执行定时器，然后在beforeDestroy或者destroyed中清除定时器

<template>
      <div class="about">
      </div>
    </template>
    <script>
    export default {
        name: "about",
        data() {
            return {
                //接收定时器
                timer: ""
            };
        },
        mounted() {
            let _this = this;
            let num = 0;
            //创建并执行定时器
            this.timer = setInterval(() => {
              //当num等于100时清除定时器
                if (num == 100) {
                    clearInterval(_this.timer);
                }
                console.log(num++);
            }, 1000);
        },
        beforeDestroy() {
            //清除定时器
            clearInterval(this.timer);
            console.log("beforeDestroy");
        },
        destroyed() {
            //清除定时器
            //clearInterval(this.timer);
            console.log("destroyed");
        }
    };
    </script>
    <style scoped>
    </style>

如果用到了缓存组件，组件是不会被销毁的,可以使用beforeRouteLeave ，离开路由之前执行的函数

  beforeRouteLeave (to, from, next) {
    // ...
    if(this.timer){
      clearInterval(this.timer)
    }
    next()
  },