var entries = [1, 2, 2, 3, 4, 5, 6, 6, 7, 7, 8, 4, 2, 1]
var unique_entries = [...new Set(entries)];...var entries = [1, [2, 5], [6, 7], 9];
var flat_entries = [].concat(...entries);
// [1, 2, 5, 6, 7, 9]...如果我们要调整数组的大小：
var entries = [1, 2, 3, 4, 5, 6, 7];
console.log(entries.length);
// 7
entries.length =...4;
console.log(entries.length);
// 4
console.log(entries);
// [1, 2, 3, 4]
如果我们要清空数组：
var entries =...[1, 2, 3, 4, 5, 6, 7];
console.log(entries.length);
// 7
entries.length = 0;
console.log(entries.length
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