js去除重复元素

var arr=[{"name":'tangchao',id:123,age:23},{name:'tangchao',id:123,age:25}
,{name:'tangchao',id:124,age:26},{name:'tangchao',id:124,age:27},{name:'tangchao',id:123,age:28},
{name:'tangchao',id:125,age:29},{name:'tangchao',id:125,age:30},
{name:'tangchao1',id:126,age:29},{name:'tangchao1',id:126,age:30}];
 console.debug(arr.distinctRepeatArray({id:'id',name:'name'}));
 
Array.prototype.distinctRepeatArray=function(ob){
var res = [], hash = {};
for ( var i = 0, elem; i<this.length &&(elem = this[i][ob.id]) != null; i++) {
if (!hash[elem]) {
res.push({id:elem,name:this[i][ob.name]});
hash[elem] = true;
}
}
return res;
}