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- <!DOCTYPE html>
- <html lang="en">
- <head>
- <meta charset="UTF-8" />
- <meta name="viewport" content="width=device-width, initial-scale=1.0" />
- <title>Document</title>
- </head>
- <body>
- <script>
- function CollectDigits(s) {
- var news = null;
- var result = "";
- for (var i = 0; i < s.length; i++) {
- news = s.charAt(i);
- // NaN 非法数字
- // isNaN 用于判断值是不是is NaN（非法数字）
- if (!isNaN(news)) {
- result += news;
- }
- }
- return result;
- }
- console.log(CollectDigits("1abc23def4")); // 输出1234
- </script>
- </body>
- </html>
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