在JavaScript中从字符串中删除所有非数字字符

问题：

Consider a non-DOM scenario where you'd want to remove all non-numeric characters from a string using JavaScript/ECMAScript. 考虑一个非DOM场景，您希望使用JavaScript / ECMAScript从字符串中删除所有非数字字符。 Any characters that are in range 0 - 9 should be kept. 应保留0 - 9范围内的任何字符。

var myString = 'abc123.8<blah>';

//desired output is 1238

How would you achieve this in plain JavaScript? 你会如何在纯JavaScript中实现这一目标？ Please remember this is a non-DOM scenario, so jQuery and other solutions involving browser and keypress events aren't suitable. 请记住这是一个非DOM场景，因此jQuery和其他涉及浏览器和按键事件的解决方案都不合适。