電腦隨機0-9選出3個數字(數字可重複)
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=BIG5">
<title>第一支javaScript</title>
</head>
<body>
<h2>document.write用法</h2>
<Script type ="text/javascript">
var r1,r2,r3,maxNum,minNum;
maxNum = 9;
minNum = 0;
r1= Math.floor( Math.random() * (maxNum - minNum + 1) ) + minNum;
r2= Math.floor( Math.random() * (maxNum - minNum + 1) ) + minNum;
r3= Math.floor( Math.random() * (maxNum - minNum + 1) ) + minNum;
document.write("亂數"+r1+r2+r3);
</Script>
</body>
</html>
電腦隨機0-9選出3個數字(數字不重複)
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=BIG5">
<title>第一支javaScript</title>
</head>
<body>
<h2>document.write用法</h2>
<Script type ="text/javascript">
var r1,r2,r3,maxNum,minNum;
maxNum = 9;
minNum = 0;
r1= Math.floor( Math.random() * (maxNum - minNum + 1) ) + minNum;
do{
var exist = true;
r2= Math.floor( Math.random() * (maxNum - minNum + 1) ) + minNum;
if(r2 != r1) exist = false;
}while (exist);
do{
var exist = true;
r3= Math.floor( Math.random() * (maxNum - minNum + 1) ) + minNum;
if(r3 != r2 && r3 != r1) exist = false;
}while (exist);
document.write("亂數"+r1+r2+r3);
</Script>
</body>
</html>
電腦隨機0-9選出3個數字(數字不重複)(按鈕版)
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=BIG5">
<title>第一支javaScript</title>
</head>
<body>
<h2>document.write用法</h2>
<Script type ="text/javascript">
function add() {
var r1,r2,r3,maxNum,minNum;
maxNum = 9;
minNum = 0;
r1= Math.floor( Math.random() * (maxNum - minNum + 1) ) + minNum;
do{
var exist = true;
r2= Math.floor( Math.random() * (maxNum - minNum + 1) ) + minNum;
if(r2 != r1) exist = false;
}while (exist);
do{
var exist = true;
r3= Math.floor( Math.random() * (maxNum - minNum + 1) ) + minNum;
if(r3 != r2 && r3 != r1) exist = false;
}while (exist);
document.getElementById('c3').value ="亂數"+r1+r2+r3;
}
</Script>
<input type="text" name="address" id="c3" <br></br>
<input type="button" value="Random" onclick="add()"/>
</body>
</html>
