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function clone(obj) {
	if (typeof obj === 'object') {
		if (obj instanceof Array) {
			let res = []
			for (let index = 0; index < obj.length; index++) {
				res[index] = clone(obj[index])
			}
			return res
		} else if (obj instanceof Object) {
			let res = {}
			for (const key in obj) {
				res[key] = clone(obj[key])
			}
			return res
		}
		// 这里还可以考虑其他特殊类型例如date regex
	} else {
		return obj
	}
}
console.log('my')
var obj1 = [12, { a: 11, b: 22 }, 5]
var obj2 = clone(obj1)
obj2[1].a += 5
console.log(obj1, obj2)