Set.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<script>
    let set6 = new Set([1, 2, 2, 3, 4, 3, 5])
    console.log('distinct 1:', set6)

    //数组去重
    let arr1 = [1, 2, 3, 4]
    let arr2 = [2, 3, 4, 5, 6]
    let set7 = new Set([...arr1, ...arr2])
    console.log('distinct 2:', set7)

    //1.向Set中添加元素。
    let set1 = new Set()
    set1.add(1)
    set1.add(2)
    set1.add(3)
    console.log('added:', set1)


    //3.判断某元素是否存在。

    let set2 = new Set()
    set2.add(1)
    set2.add(2)
    set2.add(3)
    set2.delete(1)
    console.log('has(1):', set2.has(1))
    console.log('has(2):', set2.has(2))

    //4.清除所有元素。
    let set3 = new Set()
    set3.add(1)
    set3.add(2)
    set3.add(3)
    set3.clear()
    console.log('cleared:', set3)

    //数组去重
    let arr=[1,111,33,11,11,11,34,5,6,7,4];
    console.log( new Set([...arr]))
    console.log([...arr])
</script>
</body>
</html>