1、try…catch 语句
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>now test</title>
<script>
var txt="";
function myFunction(){
try{
adddlert("welcome to hk!");
}
catch(err){
txt="本页有一个错误。\n\n";
txt+="错误描述：" + err.message + "\n\n";
txt+="点击确定继续。\n\n";
alert(txt);
}
}
</script>
</head>
<body>
<input type="button" value="查看消息" onclick="myFunction()"/>
</body>
</html>
2、带有确认框的 try…catch 语句
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>now test</title>
<script>
var txt="";
function myFunction(){
try{
adddlert("welcome to hk!");
}
catch(err){
txt="本页有一个错误。\n\n";
txt+="错误描述：" + err.message + "\n\n";
txt+="点击确定继续。\n\n";
if(confirm(txt)){
document.location.hrf="//www.baidu.com/";
}
}
}
</script>
</head>
<body>
<input type="button" value="查看消息" onclick="myFunction()"/>
</body>
</html>
3、onerror 事件
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>now test</title>
<script>
onerror=myFunction;
var txt="";
function myFunction(msg,url,l){
txt="本页有一个错误。\n\n";
txt+="错误：" + msg + "\n";
txt+="URL:" + url + "\n";
txt+="行:" + l + "\n\n";
txt+="点击确定继续。\n\n";
alert(txt);
return true;
}
function message(){
adddlert("welcome to hk!");
}
</script>
</head>
<body>
<input type="button" value="查看消息" onclick="message()"/>
</body>
</html>