在这种情况下，如何在jquery中实现限制字符？

Question

Run the code to see result, it will replace space with '-'. I want to achieve only one'-' between two text, like 'good-day', but not good----day. Therefore, I want to know how to limit only one between word in jquery.

 $('#tag').on("keydown",function(event){ var $input = $('#tag'); $input.val(function(_,v){ return v.replace(/\\s+/g,'-'); });// '-'repace space }); 

 <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script> <input type="text" id="tag" /> 

Answer 1

It is because when you enter a space it is replaced with - , then when you enter another space, (the previous one is already replaced with - ) so you have -<space> now the new space is again replaced with - so you get --

 $('#tag').on("keydown", function(event) { $(this).val(function(_, v) { return v.replace(/[\\s-]+/g, '-'); }); // '-'repace space }); 

 <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script> <input type="text" id="tag" />