javascript数组去重，数组交叉对比

[zhn4]

javascript数组去重，数组交叉对比
demo：http://jsbin.com/wofupuyiqe/edit?js,console,output

var arr1 = [1,2,3,4,5,34,34,4,5456,56,45,'happt','end']

var arr2 = [2,3,88,44,'end']

var results = []

arr1.map((data, i) => {
  arr2.map((datas, j) => {
    if(data === datas) {
      results.push(data)
    }
  })
})
// 数组交叉对比，arr1内遍历arr2对比

console.log(results)

var arr3 = [1,2,3,4,65,4,3,32,3,4,5,3,3,2,5,435,45,45,4]
var arr4 = []
arr3.map((data, i) => {
  if(arr4.indexOf(data) === -1) {
    arr4.push(data)
  }
})
// indexOf判断空数组arr4内是否存在元素，不存在就反回-1，把元素推进空数组arr4

console.log(arr4)