用户输入数字时jQuery可以添加逗号吗？

How would I go about dynamically adding commas as a user is entering numbers? Is there a good number formatter that would help? I have to add these numbers later so I eventually have to remove the commas down the line. But the screen needs to show the commas for better readability.

当用户输入数字时，我将如何动态添加逗号？是否有一个很好的数字格式化器有帮助？我必须稍后添加这些数字，所以我最终必须删除逗号。但屏幕需要显示逗号以提高可读性。

2 个解决方案

#1

Run the code snippet to see it work

运行代码段以查看它是否有效

$('input.number').keyup(function(event) {

  // skip for arrow keys
  if(event.which >= 37 && event.which <= 40) return;

  // format number
  $(this).val(function(index, value) {
    return value
    .replace(/\D/g, "")
    .replace(/\B(?=(\d{3})+(?!\d))/g, ",")
    ;
  });
});

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.0.0/jquery.min.js"></script>
<input class="number">

#2

Here's an implementation of @maček's answer in vanilla JS if you don't want to use jQuery:

如果您不想使用jQuery，这里是@maček在vanilla JS中的答案的实现：

var el = document.querySelector('input.number');
el.addEventListener('keyup', function (event) {
  if (event.which >= 37 && event.which <= 40) return;

  this.value = this.value.replace(/\D/g, '')
                         .replace(/\B(?=(\d{3})+(?!\d))/g, ',');
});

<input class="number">

#1