try...catch 语句
带有确认框的 try...catch 语句
throw 声明
onerror 事件
<html>
<head>
<script type="text/javascript">
var txt=""
function message()
{
try
{
adddlert("Welcome guest!")
}
catch(err)
{
txt="本页中存在错误。\n\n"
txt+="错误描述：" + err.description + "\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="message()" />
</body>
</html>带有确认框的 try...catch 语句
<html>
<head>
<script type="text/javascript">
var txt=""
function message()
{
try
{
adddlert("Welcome guest!")
}
catch(err)
{
txt="本页中存在错误。\n\n"
txt+="点击“确定”继续查看本页，\n"
txt+="点击“取消”返回首页。\n\n"
if(!confirm(txt))
{
document.location.href="../index.html"/*tpa=http://www.w3school.com.cn/index.html*/
}
}
}
</script>
</head>
<body>
<input type="button" value="查看消息" onclick="message()" />
</body>
</html>throw 声明
<html>
<body>
<script type="text/javascript">
var x=prompt("请输入 0 至 10 之间的数：","")
try
{
if(x>10)
throw "Err1"
else if(x<0)
throw "Err2"
else if(isNaN(x))
throw "Err3"
}
catch(er)
{
if(er=="Err1")
alert("错误！该值太大！")
if(er == "Err2")
alert("错误！该值太小！")
if(er == "Err3")
alert("错误！该值不是数字！")
}
</script>
</body>
</html>onerror 事件
<html>
<head>
<script type="text/javascript">
onerror=handleErr
var txt=""
function handleErr(msg,url,l)
{
txt="本页中存在错误。\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 guest!")
}
</script>
</head>
<body>
<input type="button" value="查看消息" onclick="message()" />
</body>
</html>转载于:https://my.oschina.net/u/2552902/blog/543885