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What problem does this feature solve?
当list的load事件失败时，提示用户加载失败，点击重新加载

Describe the solution you'd like
在load函数带一个参数，类似next方法，用户调用next方法，就不再执行check方法，除非用户点击重新加载

What does the proposed API look like?

@load="fetchSth"

methods: {
   fetchSth(handleError => {
      fetch("http://www.baidu.com").then(res => {
          // pass
      }).catch(err => {
         handleError();
      })
   })
}