每日面试题3

1.数组去重

function qc(arr2){
	let arr = [];
	for( let i = 0; i < arr1.length; i++) {
		if( arr.indexOf(arr1[i]) == -1) {
			arr.push(arr1[i])
		}
	}
	return arr;
}
arr1 = ["1","1","3","5","2","24","4","4","a","a","b"];
		
console.log(qc(arr1));