js数组删除重复值的四种方法

js去除数组中的重复值，有多种方法，本文总结了四种方法供大家参考。

1，js数组中去除重复值的方法一。

<script> 
Array.prototype.del = function() { 
var a = {}, c = [], l = this.length; 
for (var i = 0; i < l; i++) { 
var b = this[i]; 
var d = (typeof b) + b; 
if (a[d] === undefined) { 
c.push(b); 
a[d] = 1; 
} 
} 
return c; 
} 
alert([1, 1, 2, 3, 4, 5, 4, 3, 4, 4, 5, 5, 6, 7].del()); 
</script>

2，js数组中去除重复值的方法二

//去重复数组
function unique(data){
data = data || [];
var a = {};
len = data.length;
for (var i=0; i<len;i++){
var v = data[i];
if (typeof(a[v]) == 'undefined'){
a[v] = 1;
}
};
data.length=0;
for (var i in a){
data[data.length] = i;
}
return data;
}

3，js数组中去除重复值的方法三

var arr = ["123","123","123","123","sfsdf","123","345","123","123","345","456","567","sdc"];
var str = [];
for(var i = 0,len = arr.length;i < len;i++){
! RegExp(arr[i],"g").test(str.join(",")) && (str.push(arr[i]));
}
alert(str);

4，js数组中去除重复值的方法四

var pureMulti1=function(arr){
var obj={};
var a = [];
for(var i=0,l=arr.length;iif(!((arr[i]+"") in obj)){
a.push(arr[i]);
}
obj[arr[i]]="";
}
return a;
}

js数组中去除重复值的四种方法，各有特色，大家看看哪种更方便好用，择取而用之吧。