js处置JSON数据去重（大婶快来）

{                                                      
	"total":3,                                                      
	"rows":[                                                          
		{"code":"001","name":"北京市","qymc":"雪花啤酒","pfkmc":"雪花排气口1#"},         
		{"code":"002","name":"北京市","qymc":"雪花啤酒","pfkmc":"雪花排气口2#"},         
		{"code":"003","name":"上海市","qymc":"雪花啤酒","pfkmc":"雪花排气口2#"}
	]                                                          
}   

	var $a ={                                                      
	    "total":3,                                                      
	    "rows":[                                                          
	        {"code":"001","name":"北京市","qymc":"雪花啤酒","pfkmc":"雪花排气口1#"},         
	        {"code":"002","name":"北京市","qymc":"雪花啤酒","pfkmc":"雪花排气口2#"},         
	        {"code":"003","name":"上海市","qymc":"雪花啤酒","pfkmc":"雪花排气口2#"}
	    ]                                                          
	}
	
	$b = {"total":0,"rows":[]};
	var tem = $a.rows;
	var len = tem.length;
	var i=0;
	var arr = [];
	for(; i<len; i++){		
		var t = tem[i];
		if(arr.indexOf(t['name']) ==-1){
			arr.push(t['name']);
			$b.rows.push(t);
			$b.total++;
		}
		
	}
	
	var newarr = $b;