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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>菜鸟编辑</title>
<h1 style="background-color:green;">
我的第一个web程序
</h1>
</head>
<body style="background-color:pink;">
<p>
啦啦啦啦啦啦啦啦~~~~
</p>
请输入5~10之间的数字:
<input id="demo" type="text">
<button onclick="mfunction()">点一点</button>
<p id="mess"></p>
</body>
</html>
xxxxxxxxxx
function mfunction(){
try{
var x=document.getElementById("demo").value;
if(x=="") throw "值为空";
if(isNaN(x)) throw "非数字";
if(x<5) throw "值太小";
if(x>10) throw "值太大";
}
catch(err){
var y=document.getElementById("mess");
y.innerHTML="错误:"+err+"。";
h1{
color:pink;
text-align:center;
font-size:30px;