用while循环重写小明的成绩，如果用户输入不合法就反复输入，直到正确为止
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>while</title>
<script>
window.onload = function () {
while (true){
var i = 0;
var score = prompt('请输入小明的成绩');
if (score < 0 || score > 100){
alert('输入不合法，请重新输入');
continue;
}
else if(score == 100){
alert('奖励一辆BWM');
break;
}else if (score >= 80 || score <= 99){
alert('奖励一台iPhone15s');
break;
}else if(score >= 60 || score <= 79){
alert('奖励一本参考书');
break;
}else{
alert('什么奖励都没有');
break;
}
i++;
}
}
</script>
</head>
<body>
</html>
假如投资的年利率为5%，试求从1000块增长到5000块，需要花费多少年
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>while</title>
<script>
window.onload = function () {
var i = 1000;
var j = 0;
while (true){
i = i * 1.05;
if (i >= 5000){
break;
}
j++;
}
alert(j);
}
</script>
</head>
<body>
</body>
</html>
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