SOURCE

// let [a,[[b],c]]=[1,[[2],3]];
// console.log(a,b,c); 1,2,3
  
// let [,,c]=[1,2,3];
// console.log(c);   //3

// let [x]=[];
// console.log(x);  //let x;声明变量并没有赋值(解构不成功undefined)

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