数组去除重复值的四种超简便⽅法⽅式⼀：使⽤filter()
let arr1 = [1, 4, 4, 3, 1, 2, 5, 5, 9, 1]
let arr2 = []
// item：当前项，index：当前索引，arr：当前数组
arr1.filter((item, index, arr) => {
if (arr.indexOf(item) === index) {
arr2.push(item)
}
})
console.log(arr2); //[ 1, 4, 3, 2, 5, 9 ]
⽅式⼆：使⽤includes()
let arr1 = [1, 4, 4, 3, 1, 2, 5, 5, 9, 1]
let arr2 = []
arr1.forEach(item => {
if (!arr2.includes(item)) {
arr2.push(item)
}
})
console.log(arr2); //[ 1, 4, 3, 2, 5, 9 ]
⽅式三：使⽤indexOf()
字段字符串去重复let arr1 = [1, 4, 4, 3, 1, 2, 5, 5, 9, 1]
let arr2 = []
arr1.forEach(item => {
if (arr2.indexOf(item) < 0) {
arr2.push(item)
}
})
console.log(arr2); //[ 1, 4, 3, 2, 5, 9 ]
⽅式四：使⽤es6的Set()
let arr1 = [1, 4, 4, 3, 1, 2, 5, 5, 9, 1]
let arr2 = []
// Set()去⾃动去除重复项
arr2 = [...new Set(arr1)]
console.log(arr2); //[ 1, 4, 3, 2, 5, 9 ]

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