<!DOCTYPE html>
<html>
<body>
<h1>JavaScript 错误</h1>
<p>您无法 evaluate 包含语法错误的代码：</p>
<p id="demo"></p>
<script>
try {
eval("alert('Hello)");
}
catch(err) {
document.getElementById("demo").innerHTML = err.name;
</script>
</body>
</html>