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使用es7語法
//交集
let intersection = a.filter(v => b.includes(v))
//差集
let difference = a.concat(b).filter(v => !a.includes(v) || !b.includes(v))
//交集
let intersection = a.filter(v => b.includes(v))
//差集
let difference = a.concat(b).filter(v => !a.includes(v) || !b.includes(v))