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<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<style>
*{margin: 0;padding: 0;}
table{border-collapse: collapse;}
tr{border:1px solid red;}
</style>
<script>
window.onload=function(){
let clientHeight = document.documentElement.clientHeight;
let trElList = document.querySelectorAll('tbody tr');
let decHeight = 0;
trElList.forEach((item,index)=>{
if(index < 2){
console.log(item.offsetHeight)
decHeight+=item.offsetHeight
}else{
item.style.height=clientHeight - decHeight+'px';
}
})
}
</script>
</head>
<body>
<table>
<tbody>
<tr height="300">
<td>姓名</td>
</tr>
<tr height="100">
<td>蓝</td>
</tr>
<tr>
<td>黄</td>
</tr>
</tbody>
</table>
</body>
</html>