用JavaScript计算在UTF-8下存储字符串占用字节数

function mbStringLength(s) { var totalLength = 0; var i; var charCode; for (i = 0; i < s.length; i++) { charCode = s.charCodeAt(i); if (charCode < 0x007f) { totalLength = totalLength + 1; } else if ((0x0080 <= charCode) && (charCode <= 0x07ff)) { totalLength += 2; } else if ((0x0800 <= charCode) && (charCode <= 0xffff)) { totalLength += 3; } } //alert(totalLength); return totalLength; }