Javascript 函数需要允许数字、点和逗号

2022-01-17 00:00:00 function regex numbers javascript

我需要创建一个函数来允许数字点和逗号.所以任何人纠正以下功能

I need to create a function to allow numbers dot and comma. So anyone corrects the following function

function on(evt) {
  var theEvent = evt || window.event;
  var key = theEvent.keyCode || theEvent.which;
  key = String.fromCharCode( key );
  var regex = /[0-9]|./;
  if( !regex.test(key) ) {
    theEvent.returnValue = false;
    if(theEvent.preventDefault) theEvent.preventDefault();
  }
}

推荐答案

首先，您的正则表达式当前不允许逗号，这是您的要求.

Firstly your regex currently doesn't allow comma, which is your requirement.

其次，您没有使用任何量词，因此您的正则表达式将仅匹配单个字符 - [0-9] 或 dot 之一.您需要使用量词.

Secondly, you haven't used any quantifier, so your regex will match only a single character - one of [0-9] or a dot. You need to use a quantifier.

第三，不使用管道，你可以只移动字符类中的所有字符.

Thirdly, instead of using pipe, you can move all characters inside the character class only.

尝试使用以下正则表达式:

Try using the below regex:

/^[0-9.,]+$/

量词 + 用于匹配 1 次或多次出现的模式.
^ 和 $ 锚分别匹配字符串的开头和结尾.

Quantifier + is used to match 1 or more occurrence of the pattern.
^ and $ anchors match the beginning, and end of the string respectively.

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