Vue路由跳转(返回上一页如果不存在则带参返回到指定页面)

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      backNav() {
        var id = this.$route.query.id
        if (window.history.length <= 1) {
          this.$router.push({
            path: '/',
            query: {
              id: id
            }
          })
          return false
        } else {
          this.$router.back()
          return false
        }
      }

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