!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd" html xmlns="http://www.w3.org/1999/xhtml" head meta http-equiv="Content-Type" content="text/html; charset=gb2312" / titlecookie/title script src="http://jqueryjs.googlecode.com/files/jquery-1.3.2.min.js" type="text/javascript"/script style *{ margin:0; padding:0;font-family:"宋体",Arial, Helvetica, sans-serif;} #best{ width:300px; height:200px; border:1px solid #ccc; margin:60px auto 0; line-height:1.6; font-size:14px; padding:10px 0 0 10px} .blank{ font-size:18px; font-weight:bold; text-align:center; padding:20px} /style script type="text/javascript" jQuery.fn.limit=function(){ var self = $("div[limit]"); self.each(function(){ var objString = $(this).text(); var objLength = $(this).text().length; var num = $(this).attr("limit"); if(objLength num){ $(this).attr("title",objString); objString = $(this).text(objString.substring(0,num) + "..."); } }) } $(function(){ $(document.body).limit(); }) /script /head body div class="blank"请按F5刷新页面。。。。/div div id="best" div limit="12"计算字串的长度长度长度长度/div div limit="10"这边有优化很公开这边/div div limit="12"这边有优化很公开长度长度很公开长度/div div limit="12"计算字长度长度/div div limit="10"这边有优化很边有优化很边有优化很边有优化很边有优化很/div /div /body /html
    [Ctrl+A 全选 注:如需引入外部Js需刷新才能执行]

下面是对一些数字进行格式化
我们想改变这么一段代码中间td之间的文本
table
tr id='generated_rows'
td class='row_class' id='row_id_1'1/td
td class='row_class' id='row_id_2'2/td
td class='row_class' id='row_id_3'3/td
td class='row_class' id='row_id_4'4/td
td class='row_class' id='row_id_5'5/td
/tr
/table

实现显示为：

table
tr id='generated_rows'
td class='row_class' id='row_id_1'1.00/td
td class='row_class' id='row_id_2'2.00/td
td class='row_class' id='row_id_3'3.00/td
td class='row_class' id='row_id_4'4.00/td
td class='row_class' id='row_id_5'5.00/td
/tr
/table
实现的函数为：
$('#generated_rows td.row_class').each(function() {
var x = Number($(this).text()).toFixed(2);
$(this).text(x);
});
演示代码
!DOCTYPE html PUBLIC '-//W3C//DTD XHTML 1.0 Transitional//EN' 'http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd' html xmlns='http://www.w3.org/1999/xhtml' head meta http-equiv='Content-Type' content='text/html; charset=gb2312' / title需要F5刷新一下/title script src='http://jqueryjs.googlecode.com/files/jquery-1.3.2.min.js' type='text/javascript'/script style *{ margin:0; padding:0;font-family:'宋体',Arial, Helvetica, sans-serif;} #best{ width:300px; height:200px; border:1px solid #ccc; margin:60px auto 0; line-height:1.6; font-size:14px; padding:10px 0 0 10px} .blank{ font-size:18px; font-weight:bold; text-align:center; padding:20px} /style /head body 需要F5刷新一下 table tr id='generated_rows' td class='row_class' id='row_id_1'1/td td class='row_class' id='row_id_2'2/td td class='row_class' id='row_id_3'3/td td class='row_class' id='row_id_4'4/td td class='row_class' id='row_id_5'5/td /tr /table script type="text/javascript" $('#generated_rows td.row_class').each(function() { var x = Number($(this).text()).toFixed(2); $(this).text(x); }); /script /body /html
[Ctrl+A 全选 注:如需引入外部Js需刷新才能执行]