this.plans = [
       {
         id: 0,
         name: '小明',
         age: 15
       },
       {
         id: 1,
         name: '小花',
         age: 20
       },
       {
         id: 2,
         name: '小天',
         age: 19
       }
     ]
     const [a, ...b] = this.plans
     console.
 
log(a,b)

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