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HarmonyOS
<!DOCTYPE html>
<html>
<head>
<title>example</title>
<script>
var toggleHidden=function(){
var elem= document.getElementById('toggle');
if(elem.hasAttribute("hidden")){
elem.removeAttribute("hidden")
}else{
elem.setAttribute("hidden","hidden");
}}
</script>
</head>
<body>
<button onclick="toggleHidden()">toggle</button>
<table>
<tr><th>Name</th> <th>City</th></tr>
<tr id="toggle" hidden=""><td>Kevin</td><td>Shijiazhuang</td></tr>
<tr><td>Kevin</td><td>Shijiazhuang</td></tr>
</table></body>
</html>
1、body闭合标签下面多了个 ‘<’;
2、<button onclick="toggleHidden()">toggle</button>
3、var elem= documet.getElementById('toggle');document???