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48 lines (46 loc) · 1.03 KB
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<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
<script type="text/javascript">
/* try 语句测试代码块的错误。
catch 语句处理错误。
throw 语句创建自定义错误。
*/
var txt="";
function message()
{
try {
adddlert("Welcome guest!");
} 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);
}
}
function myFunction(){
try{
var x=document.getElementById("demo").value;
if (x=="") throw "值为空";
if (isNaN(x)) throw "不是数字";
if(x>10) throw "数字太大";
if (x<5) throw "数字太小"
}
catch(err)
{
var y=document.getElementById("mess");
y.innerHTML="错误："+err +"。 ";
}
}
</script>
<input type="button" value="查看消息" onclick="message()" />
<p>请输出一个 5 到 10 之间的数字:</p>
<input id="demo" type="text">
<button type="button" onclick="myFunction()">测试输入</button>
<p id="mess"></p>
</body>
</html>