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轉自：http://www.cnblogs.com/lori/p/3907960.html
<html><script src="http://common.cnblogs.com/script/jquery.js" type="text/javascript"></script><body> <input type="text" name="username" /></body><script type="text/ecmascript"> var GetLength = function (str) { ///<summary>獲得字串實際長度，中文2，英文1</summary> ///<param name="str">要獲得長度的字串</param> 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; }; //js截取字串，中英文都能用 //如果給定的字串大於指定長度，截取指定長度返回，否者返回源字串。 //字串，長度 /** * js截取字串，中英文都能用 * @param str：需要截取的字串 * @param len: 需要截取的長度 */ function cutstr(str, len) { var str_length = 0; var str_len = 0; str_cut = new String(); str_len = str.length; for (var i = 0; i < str_len; i++) { a = str.charAt(i); str_length++; if (escape(a).length > 4) { //中文字元的長度經編碼之後大於4 str_length++; } str_cut = str_cut.concat(a); if (str_length >= len) { str_cut = str_cut.concat("..."); return str_cut; } } //如果給定字串小於指定長度，則返回源字串； if (str_length < len) { return str; } }$(function () { $("input[name=username]").bind(‘keyup‘, function () { if (GetLength($(this).val()) > 10) { $(this).val(cutstr($(this).val(), 10)); return; } }); }); </script> </html>
JS~字串長度判斷，超出進行自動截取（支援中文）
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