JS----几种过滤重复的数组的方法

个人总结的三种过滤重复的数组的方法

方法1：

<script>
	function unique(target) {  
	  var result = [];  
	  loop: 
	  for (var i = 0, n = target.length; i < n; i++){  
		for (var x = i + 1; x < n; x++) {  
		  if (target[x] === target[i])
			continue loop;   
		}  
		result.push(target[i]);  
	  }  
	  return result;  
	}
	var arr = ["a","b","b","c",1,2,2,3]
	alert(unique(arr));	//a,b,c,1,2,3
</script>

方法2：

<script>
	Array.prototype.distinct = function () {  
	  var newArr = [],obj = {};  
	  for(var i=0, len = this.length; i < len; i++){  
		if(!obj[typeof(this[i]) + this[i]]){  
		  newArr.push(this[i]);  
		  obj[typeof(this[i]) + this[i]] = "new";  
		}  
	  }  
	  return newArr;
	} 

	var arr =["a","b","b","c"];
	alert(arr.distinct());
</script>

方法3：

<script>
	Array.prototype.distinct = function () {   
	  var sameObj = function(a, b){   
		var tag = true;   
		if(!a || !b) return false;   
		for(var x in a){   
		  if(!b[x]) return false;   
		  if(typeof(a[x]) === "object"){   
			tag = sameObj(a[x],b[x]);   
		  } else {   
			if(a[x]!==b[x])   
			return false;   
		  }   
		}   
		return tag;   
	  }   
	  var newArr = [], obj = {};   
	  for(var i = 0, len = this.length; i < len; i++){   
		if(!sameObj(obj[typeof(this[i]) + this[i]], this[i])){   
		newArr.push(this[i]);   
		obj[typeof(this[i]) + this[i]] = this[i];   
		}   
	  }   
	  return newArr;   
	} 
	//一维数组
	var arr =["a","b","b","c"];
	alert(arr.distinct());
	
	//关联数组
	var arr=[{name:"tom",age:12},{name:"lily",age:22},{name:"lilei",age:12}];  
	var newArr=arr.distinct(function(ele){  
		return ele.age;  
	});

	alert("重复项："+newArr[0]["age"])
</script>