# 数组去重
- 方法一: 循环
let arr = [1,2,3,4,5,5,6,2,3,4,3,1]
let tag = []
for(let i = 0; i < arr.length;i++){
if(!tag.includes(arr[i])){
tag.push(arr[i])
}
}
let tag = arr.filter(item,index,arr)=>{
return arr.indexOf(item) === index
}
- 方法二: set
let arr = [1,2,3,4,5,5,6,2,3,4,3,1]
let tag = [...new Set(arr)]