<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Title</title>
  <script>
    /**
     * 獲取字符串實(shí)際長(zhǎng)度(包含中英文)
     * @param str  要獲得長(zhǎng)度的字符串
     */
    var zfc = {};
    zfc.getStringLength = function (str) {
      var realLength = 0, len = str.length, charCode = -1;
      for (var i = 0; i < len; i++) {
        charCode = str.charCodeAt(i);
        if (charCode >= 0 && charCode <= 128)
          realLength += 1;
        else
          realLength += 2;
      }
      return realLength;
    };
    console.log(zfc.getStringLength('aaa獲取字符sfdsf串實(shí)際長(zhǎng)度(包含中英文)sdfdsf'))
  </script>
</head>
<body>
 
</body>
</html>

方法二: 簡(jiǎn)化版使用charCodeAt()來判斷字符編碼

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Title</title>
  <script>
    /**
     * 獲取字符串實(shí)際長(zhǎng)度(包含中英文)
     * @param str  要獲得長(zhǎng)度的字符串
     */
    var zfc = {};
    zfc.getStringLength = function (str) {
      var len = str.length;
      var realLength = 0;
      for (var i = 0; i < len; i++) {
        if ((str.charCodeAt(i) & 0xff00) != 0) {
          realLength++;
        }
        realLength++;
      }
      return realLength;
    };
    console.log(zfc.getStringLength('aaa獲取字符sfdsf串實(shí)際長(zhǎng)度(包含中英文)sdfdsf'))
  </script>
</head>
<body>
 
</body>
</html>

方法三: 先把中文替換成兩個(gè)字節(jié)的英文，再計(jì)算長(zhǎng)度（推薦使用）

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Title</title>
  <script>
    /**
     * 獲取字符串實(shí)際長(zhǎng)度(包含中英文)
     * @param str  要獲得長(zhǎng)度的字符串
     */
    var zfc = {};
    zfc.getStringLength = function (str) {
      return str.replace(/[\u0391-\uFFE5]/g, 'aa').length;
    };
    console.log(zfc.getStringLength('aaa獲取字符sfdsf串實(shí)際長(zhǎng)度(包含中英文)sdfdsf'))
  </script>
</head>
<body>
 
</body>
</html>

到此這篇關(guān)于JavaScript獲取字符串實(shí)際長(zhǎng)度的文章就介紹到這了。希望對(duì)大家的學(xué)習(xí)有所幫助，也希望大家多多支持腳本之家。

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