set方法
let arr = [2, 5, 6, 2, 5, 9, 2, 5, 9]indexof方法
let newArr = [...new Set(arr)]
console.log(newArr)
let arr = [2, 5, 6, 2, 5, 9, 2, 5, 9]
let newArr = []
arr.forEach(item => {
if (newArr.indexOf(item) == -1) {
newArr.push(item)
}
})
console.log(newArr)
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