假如隨機一個1000以內的三位數，如果是二位數則變為0xx，如果是一位數則變為00x
<html>
<head>
<meta?http-equiv="Content-Type"?content="text/html;?charset=utf-8"?/>
<title>Math?</title>
<script?type="text/javascript">
function?MATH(){
????var?num=Math.round(Math.random()*999);
????document.getElementById("text1").value?=?num;
}
</script>
</head>
<body>
????<from>
????????<input?type="text"?name="text"?id="text1">
????????<input?type="button"?name="button"?value="刷新"?onclick="MATH()">
????</from>
</body>
</html>
2020-12-09
function?MATH(){
????var?num=Math.round(Math.random()*999);
????var str = num > 99 ? num : (num > 9 ? '0' + num : '00' + num)
????document.getElementById("text1").value?= str;
}
2020-12-09
額..
function?MATH(){
?????var num=Math.round(Math.random()*999);
???? var str;
???? if(num > 99){
???? str = num
???? }else if(num > 9 && num <= 99){
???? str = '0' + num
???? }else{
???? str = '00' + num
???? }
????document.getElementById("text1").value?= str;
}