js清空table的tbody中的数据

1、HTML结构

<table id = "test">
    <thead>
        <tr><td>列1td><td>列2td><td>列3td><td>列4td>tr>
    thead>
    <tbody>
        <tr><td>1td><td>1td><td>2td><td>3td>tr>
        <tr><td>2td><td>4td><td>5td><td>6td>tr>
        <tr><td>3td><td>7td><td>8td><td>9td>tr>
        <tr><td>4td><td>1td><td>2td><td>3td>tr>
    tbody>     
table>
<input type="button" id="btn" value="清空">

2、jquery代码

$(function(){
    $("#btn").click(function() {
        $("#test tbody").html("");
    });
});