当我尝试使用eq（）删除类时，它无效并在控制台TypeError中给出错误：$(...).removeclass is not a function
$("table tr:eq(9)").removeclass('mandatory');**strong text**
html代码：
<html> <head> <script type="text/javascript"
src="http://ajax.googleapis.com/ajax/libs/jquery/1.3.1/jquery.min.js"></script>
<script type="text/javascript" src="anim_navbar_webmuch.js"></script>
</script> <script type="text/javascript" src="table.js"> </script>
<style type="text/css"> .mandatory { background-color:red; color:blue;
} </style> </head> <body>
<table> <tr><td><h2 style="
background-color:blue;">table</h2></td></tr>
<tr><td><p>hdshjdshdskhjkds</p></td></tr> <tr><td>Yes<input
name="yescheck" id="one" type="checkbox" value="yes" > </td></tr>
<tr><td>No<input type="checkbox" value="no" name="nocheck"></td></tr>
<tr><td><p>Hi to alll</p></td></tr> <tr><td>Yes<input name="yesnext"
type="checkbox" value="yes"></td></tr> <tr><td>No<input name="nonext"
type="checkbox" value="no"></td></tr> <tr><td><p>Hi to
alll</p></td></tr> <tr><td>hi<input type="textbox"></td></tr> <tr><td
class="mandatory">hi1<input type="textbox"></td></tr>
<tr><td>hi2<input type="textbox"></td></tr> <tr><td>hi3<input
type="textbox"></td></tr> <tr><td>hi4<input type="textbox"></td></tr>
<tr><td>hi5<input type="textbox"></td></tr> <tr><td>hi6<input
type="textbox"></td></tr> <tr><td>Hi7 <select> <option
value="volvo">Volvo</option> <option value="saab">Saab</option>
<option value="mercedes">Mercedes</option> <option
value="audi">Audi</option> </select> </td></tr> </table>
<button>submit</button> </body> </html>
JS
$(document).ready(function(){
var checkyes1 = $('input:checkbox[name=yescheck]');
checkyes1.click(function(){
//var checkConf =$checkyes1.attr('checked',true);
if(this.checked)
{
checkno1.attr('disabled',true);
//alert("jj");
$("table tr").eq(1).hide();
$("table tr").slice(5).hide();
$("table tr").slice(8,14).show();
$("table tr:eq(9)").removeclass('mandatory');
//$("body p").hide();
console.log($("table tr:eq(9)").length);
}
else{
checkno1.attr('disabled',false);
$("table tr").slice(8,14).hide();
}
});
//$checkyes1.prop("checked",true);
});