js异常处理
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>W3Cschool教程(w3cschool.cn)</title>
</head>
<body>
<h1>我的第一个 Web 页面</h1>
<button id = "demo">clock me</button>
<script>
document.getElementById("demo").addEventListener("click",myfun);
function myfun(){
//JavaScript 错误处理 Throw、Try 和 Catch
try{
var a = 3;
var b = 5;
if(a!=b) throw "a 不等于 b";
}catch(err){
document.write(err);
}
}
</script>
</body>
</html>
