<!DOCTYPE html>
<html>
<head>
<title>123</title>
</head>
<body>
<table id="table01">
<tbody>
<tr>
<td>John</td>
<td>Doe</td>
<td>Alaska</td>
</tr>
<tr>
<td>AAA</td>
<td>BBB</td>
<td>CCC</td>
</tr>
</tbody>
</table>
<button οnclick="fun01()">成功的查询</button>
<button οnclick="fun02()">失败的查询</button>
<script>
function fun01() { //成功的
var table = document.getElementById("table01");
var tbody = table.getElementsByTagName('tbody')[0];
var trs = tbody.getElementsByTagName("tr");
for ( var i = 0; i < trs.length; i++) {
var tr = trs[i];
var tds = tr.getElementsByTagName("td");
for ( var j = 0; j < tds.length; j++) {
var td = tds[j];
console.log("i:" + i + " j: " + j + " " + td.innerHTML);
}
}
}
function fun02() { //失败的
var table = document.getElementById("table01");
var tbodys = table.childNodes;
console.log(tbodys);
var tbody = tbodys[1];
var trs = tbody.childNodes;
console.log(trs);
var tds = trs[1].childNodes;
console.log(tds);
}
</script>
</body>
</html>
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