如何实现数组的随机排序？

var arr = [1,2,3,4,5,6,7,8,9]
function randomsort1 (arr) {
	for (let i = 0, len = arr.length; i < len; i++) {
		const ran = parseInt(Math.random() * len)
		const temp = arr[ran]
		arr[ran] = arr[i]
		arr[i] = temp
	}
	return arr
}
function randomsort2 (arr) {
	const newarr = []
	while (arr.length) {
		const ran = parseInt(Math.random() * arr.length)
		newarr.push(arr[ran])
		arr.splice(ran, 1)
	}
	return newarr
}
function randomsort3 (arr) {
	return arr.sort(() => Math.random() - 0.5)
}