<!DOCTYPE html>
<html>
<body>
<script>
Array.prototype.deleteEle=function(){
var newArr = this;
for (var i=newArr.length-1; i>=0; i--)
{
var targetNode = newArr[i];
for (var j=0; j<i; j++)
{
if(targetNode == newArr[j]){
newArr.splice(i,1);
break;
}
}
}
return newArr;
}
var arr = ["a","b","c","c","ab","d","ab","d","c"];
console.log(arr.deleteEle());
</script>
</body>
</html>
<!DOCTYPE html>
<html>
<body>
<script>
var a = [5,4,3,2,1,2,3,2,1,];
Array.prototype.duplicate=function() {
var tmp = [];
this.concat().sort().sort(function(a,b){
if(a==b && tmp.indexOf(a) === -1) tmp.push(a);
});
return tmp;
}
console.log(a.duplicate())
</script>
</body>
</html>
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