数组去重练习

<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>数组去重</title>
<style>

</style>
<script>
window.onload=function(){
var arr=[1,4,4,6,7,8,4,5,2,2,7];

for(var i=0;i<arr.length;i++){
for(var j=i+1;j<arr.length;j++){
if(arr[i]==arr[j]){
arr.splice(j,1);
j--;
}
}
}
alert(arr);
}
</script>
</head>