方法一：indexOf
var arr=[2,8,5,0,5,2,6,7,2];
function array_unique(arr){
var result = [];
for (var i = 0; i < arr.length; i++) {
if(hash.indexOf(arr[i])==-1){
result.push(arr[i]);
}
}
return result;
}
方法二：filter
var arr = [1, 2, 3, 1, 2, 3, 4, 5, 5];
var resultArr;
resultArr = arr.filter( function (item, index, self) {
return self.indexOf(item) == index;
});