<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>数组去重</title>
</head>
<body>
<script>
// 数组去重
// 方法一（原理性）：
var arr = [2, 5, 12, 21, 54, 22, 61, 6, 1, 72, 4, 1, 3, 5, 3, 51, 4, 2, 22]
var result = []
for (var i = 0; i < arr.length; i++) {
var flag = true
for (var j = 0; j < result.length; j++) {
if (arr[i] === result[j]) {
flag = false
break
}
}
if (flag === true) {
result[result.length] = arr[i]
}
}
// 方法二:
// var result = new Set(arr)
console.log(result)
</script>
</body>
</html>
