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目录

JS数组去重方法 ​

方法一、 Array.filter()

var arr=[1,2,1,2,3]
var uniqueArray=arr.filter(function(item,pos){
   return arr.indexOf(item)==pos 
})console.log( uniqueArray ) //[1,2,3]

方法二、[Set.prototype](https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Global_Objects/Set)

const set1 = new Set([1, 2, 3, 2, 1])

console.log(set1) // [1,2,3]

方法三、Array.prototype.reduce()

let arr=[1,2,1,2,3]
const uniqueArray=arr.sort().reduce((init,current)=>{
   if(init.legnth===0||init[init.length-1]===current){
       init.push(current) 
    }
    return init
},[])console.log(uniqueArray) // [1,2,3]

参考：

  1. https://stackoverflow.com/questions/9229645/remove-duplicate-values-from-js-array
  2. https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Global\_Objects/Array/filter