<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
</head>
<body>
<script>
var arr=[1,2,3,1,4,5,1];
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>
</body>
</html>
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