1.created(){
    window.addEventListener('keydown',this.handleKeyDown,true)
    //开启键盘监听模式
}
2.methods{
   search() {
   this.$refs.table.search()
   },
   handleKeyDown(e){
   let key = null;
   if(window.event === undefined){
        key = e.keyCode;
      } else {
         key = window.event.keyCode;
      }
      if (key === 13) {
         this.search();
      }
   }
}
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