基础就不说了，下面是直接贴源代码
(function ($) { $.extend($, { fixedWidth: function (str, length, char) { str = str.toString(); if (!char) { char = "..."; } var num = length - lengthB(str); if (num < 0) { str = substringB(str, length - lengthB(char)) + char; } return str; function substringB(str, length) { var num = 0; var len = str.length; var tem = ""; if (len) { for (var i = 0; i < len; i++) { if (num > length) { break; } if (str.charCodeAt(i) > 255) { num += 2; tem += str.charAt(i); } else { num++; tem +=str.charAt(i); } } } return tem; } function lengthB(str) { var len = str.length; var num = 0; if (len) { for (var i = 0; i < len; i++) { if (str.charCodeAt(i) > 255) { num += 2; } else { num++; } } } return len; } } }); })(jQuery)
用法不是很难，下面是具体的用法
方法：
function clkfun() { var value = $("#txtInput").val(); $("#fixedID").text($.fixedWidth(value, 9)); }
HTML页面
<body>
<div>
<div id="fixedID" style="margin: 0px; padding: 0px; 55px; height: 24px; line-height: 24px; font-size:12px;
border: 1px solid red; overflow: hidden;">
</div>
<div>
<input type="text" name="txtInput" value="45646464646" id="txtInput" />
<input type="button" name="btnClick" value="Click " onclick="clkfun();" />
</div>
</div>
<form id="form1" runat="server">
<div>
<div>
</div>
</div>
</form>
</body>