JS去重的几种方法 

<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title></title>
	</head>
	<body>
		<script>
		    //第一种方法
			Array.prototype.removeDuplicate = function(){
	            var n = [];
	            for(var i=0;i<this.length;i++){
	                if(n.indexOf(this[i]) == -1 ){
	                    n.push(this[i]);
	                }
	            }
	            return n;
	        }
			 var arr = [1,2,3,3,2,'我','我',34,'我的',NaN,NaN];
	        var m1 = arr.removeDuplicate();
	        console.log(m1);//[1, 2, 3, "我", 34, "我的", NaN, NaN]
	        
	        //第二种方法
			Array.prototype.removeDuplicate = function(){
	            var n = [];
	            for(var i=0;i<this.length-1;i++){
	                if(this.indexOf(this[i]) == i){
	                    n.push(this[i]);
	                }
	            }
	            return n;
	        }
	        var m2 = arr.removeDuplicate();
	        console.log(m2);//[1, 2, 3, "我", 34, "我的"]
	        
	        //第三种方法
	        Array.prototype.removeDuplicate = function(){
	            var n = [],m = {};
	            for(var i=0;i<this.length;i++){
	                if(!m[this[i]]){
	                    m[this[i]] = true;
	                    n.push(this[i]);
	                }
	            }
	            return n;
	        }
	        var m3 = arr.removeDuplicate();
	        console.log(m3);//[1, 2, 3, "我", 34, "我的", NaN]
	        
	        //第四种方法
	        Array.prototype.removeDuplicate = function(){
	            var n = [];
	            this.sort();
	            for(var i=0;i<this.length;i++){
	                if(this[i] != this[i+1]){
	                    n.push(this[i]);
	                }
	            }
	            return n;
	        }
	        var m4 = arr.removeDuplicate();
	        console.log(m4);//[1, 2, 3, 34, NaN, NaN, "我", "我的"]			
		</script>
		
	</body>
</html>

　　

posted @ 2016-12-19 18:00  归尘2016  阅读(1274)  评论(0)  编辑  收藏  举报