Clear the route cache in Vue

scene ：
A Jump B,B Jump C.B stay A The first jump B When , Made a cache ,A Jumping around B When , You won't go through the life cycle again .
But the real scene is ,A In every time Jump B When , Want to refresh , and C Back in B When ,B Need to keep the scene , That is to say, using cache to render .

Here's the picture ：

Now comes the question , How to solve the problem in the purple circle , eliminate pageB Page cache .

Solutions ：
Each time the pageB return pageA When , eliminate pageB Cache data .
So next time pageA Jump pageB When , The first cached data will not be read because there is cached data , And in the pageC return pageB When , Also read the first cache pageB The data of the , because , Every time pageB Cache data , Back in pageA It will be empty when .

The specific needs are pageB Add the following code to ：
Be careful beforeRouteLeave Is and methods Of the same rank

  beforeRouteLeave (to, from, next) {
    
    if (to.name === 'pageA') {
    
      // console.log(' Go back to the administration page ')
      if (this.$vnode && this.$vnode.data.keepAlive) {
    
        if (this.$vnode.parent && this.$vnode.parent.componentInstance && this.$vnode.parent.componentInstance.cache) {
    
          if (this.$vnode.componentOptions) {
    
            var key = this.$vnode.key == null
              ? this.$vnode.componentOptions.Ctor.cid + (this.$vnode.componentOptions.tag ? `::${
      this.$vnode.componentOptions.tag}` : '')
              : this.$vnode.key
            var cache = this.$vnode.parent.componentInstance.cache
            var keys = this.$vnode.parent.componentInstance.keys
            if (cache[key]) {
    
              if (keys.length) {
    
                var index = keys.indexOf(key)
                if (index > -1) {
    
                  keys.splice(index, 1)
                }
              }
              delete cache[key]
            }
          }
        }
      }
      this.$destroy()
    }
    next()
  },

Has the problem been solved ？ If you have any questions, welcome to discuss .