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Arr = {}
//数组去重
Arr.unique = function (arr){
var hash=[];
for (var i = 0; i < arr.length; i++) {
for (var j = i+1; j < arr.length; j++) {
if(arr[i]===arr[j]){
++i;
}
}
hash.push(arr[i]);
}
return hash;
}