参考此文档

var arrays = [1,2,3,2,4,6,5,7]
	function unique (arrray) {
		var result=[]
		//请编程实现数组去重
		return result;
	}	

1.ES6的set对象去重

result = [...new Set(array)];

2.利用对象属性的唯一性

let obj = {};
        for (let i of array) {
           	if (!obj[i]) {
               	result.push(i);
               	obj[i]=1;
            }
        }

3.利用sort方法排序去重

var newarray = array.sort();
        result = [newarray[0]];
        var length = newarray.length;
        for( var i = 1 ;i<length; i++) {
            newarray[i] !== newarray[i-1] && result.push(newarray[i]);
        }	

4.用includes来进行去重

for(var i of array) {
           	!result.includes(i) && result.push(i);
        }

5.用filter结合indexof来进行去重

???
result = array;
        return result.filter((item, index)=> {
            return result.indexOf(item) === index
        })