标签：body console function dup 元素 lang pre UNC 示例
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
<script>
//封装函数,找出数组 arr 中重复出现过的元素.
//示例: console.log(duplicates( [1, 2, 4, 4, 3, 3, 1, 5, 3] ));
//返回结果: 1, 3, 4
function duplicates(arr) {
arr.sort(function (n, m) {
return n - m;
});
var subArr = [];
for (var i = 0; i < arr.length; i++) {
if (arr[i] == arr[i + 1]) {
subArr.push(arr[i]);
}
}
subArr.sort(function (n, m) {
return n - m;
});
for (var i = 0; i < subArr.length; i++) {
if (subArr[i] === subArr[i + 1]) {
subArr.splice(i, 1);
i--;
}
}
return subArr;
}
console.log(duplicates([1, 2, 4, 4, 3, 3, 1, 5, 3]))
</script>
</body>
</html>
标签：body console function dup 元素 lang pre UNC 示例
原文地址：https://www.cnblogs.com/yxs1530/p/10242451.html
