JS数组去重方法总结

var arr=[2,8,5,0,5,2,6,7,2];
function unique1(arr){
var hash=[];
for (var i = 0; i < arr.length; i++) {
if(hash.indexOf(arr[i])==-1){
hash.push(arr[i]);
}
}
return hash;

}

Array.prototype.distinct = function(){

var arr = this,

result = [],

i,

j,

len = arr.length;

for(i = 0; i < len; i++){

for(j = i + 1; j < len; j++){

if(arr[i] === arr[j]){

j = ++i;

}

}

result.push(arr[i]);

}

return result;

}

var arra = [1,2,3,4,4,1,1,2,1,1,1];

arra.distinct(); //返回[3,4,2,1]

Array.prototype.distinct = function (){

var arr = this,

i,

j,

len = arr.length;

for(i = 0; i < len; i++){

for(j = i + 1; j < len; j++){

if(arr[i] == arr[j]){

arr.splice(j,1);

len--;

j--;