Question

如何从JavaScript中的文本中删除多余的空格（即一行中多个空白字符）？

E.g

match    the start using.

如何删除“match”和“the”之间的所有空格？

Answer 1

使用正则表达式。示例代码如下：

var string = 'match    the start using. Remove the extra space between match and the';
string = string.replace(/\s{2,}/g, ' ');

为了获得更好的性能，请使用以下正则表达式：

string = string.replace(/ +/g, ' ');

使用萤火虫进行分析后得出以下结果：

str.replace(/ +/g, ' ')        ->  790ms
str.replace(/ +/g, ' ')       ->  380ms
str.replace(/ {2,}/g, ' ')     ->  470ms
str.replace(/\s\s+/g, ' ')     ->  390ms
str.replace(/ +(?= )/g, ' ')    -> 3250ms

Answer 2

请参阅MDN上的string.replace

您可以这样做：

var string = "Multiple  spaces between words";
string = string.replace(/\s+/,' ', g);

Answer 3

  function RemoveExtraSpace(value)
  {
    return value.replace(/\s+/g,' ');
  }

Answer 4

myString = Regex.Replace(myString, @"\s+", " ");

甚至：

RegexOptions options = RegexOptions.None;
Regex regex = new Regex(@"[ ]{2,}", options);     
tempo = regex.Replace(tempo, @" ");

Answer 5

使用正则表达式。

var string = "match    the start using. Remove the extra space between match and the";
string = string.replace(/\s+/g, " ");

这是jsfiddle for this

Answer 6

这也可以使用javascript逻辑来完成。
这是我为该任务编写的可重用函数。
LIVE DEMO

<!DOCTYPE html>
<html>
  <head>
  </head>
  <body>
    <div>result: 
      <span id="spn">
      </span>
    </div>
    <input type="button" value="click me" onClick="ClearWhiteSpace('match    the start using.  JAVASCRIPT    CAN    BE   VERY  FUN')"/>
    <script>
      function ClearWhiteSpace(text) {
        var result = "";
        var newrow = false;
        for (var i = 0; i < text.length; i++) {
          if (text[i] === "\n") {
            result += text[i];
            // add the new line
            newrow = true;
          }
          else if (newrow == true && text[i] == " ") {
            // do nothing
          }
          else if (text[i - 1] == " " && text[i] == " " && newrow == false) {
            // do nothing
          }
          else {
            newrow = false;
            if (text[i + 1] === "\n" && text[i] == " ") {
              // do nothing it is a space before a new line
            }
            else {
              result += text[i];
            }
          }
        }
        alert(result);
        document.getElementById("spn").innerHTML = result;
        return result;
      }
    </script>
  </body>
</html>

Answer 7

做，

var str = "match    the start using. Remove the extra space between match and the";
str = str.replace( /\s\s+/g, ' ' );

Answer 8

当然，使用正则表达式：

var str = "match    the start using. Remove the extra space between match and the";
str = str.replace(/\s/g, ' ')

Answer 9

试试这个正则表达式

var st = "hello world".replace(/\s/g,'');

或作为一种功能

    function removeSpace(str){
      return str.replace(/\s/g,'');
    }

这是一个有效的demo

如何在JavaScript中删除字符串中的额外空格？

9 个答案: