if1
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
<script type="text/javascript">
var score=prompt('请输入小明的成绩')
if(score > 100 || score < 0 || isNaN(score)){
alert("玩什么玩写作业去");
}else{
//根据score的值来决定给小明什么奖励
if(score == 100){
//奖励一台宝马
alert("宝马拿去，随便开~~");
}else if(score >= 80){
//奖励一个手机
alert("手机拿去，随便玩~~");
}else if(score >= 60){
//奖励一本参考书
alert("书拿走，随便看~~");
}else{
alert("棍子一根~~");
}
}
</script>
</head>
<body>
</body>
</html>
if2
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>if练习</title>
<script type="text/javascript">
var height = prompt("请输入身高");
var money = prompt("请输入财富值");
var face = prompt("请输入颜值[百分之%]");
if (height>=180 && money>=10000 && face>=100){
alert("我一定嫁给他");
}
else if(height>=180 || money>=10000 || face>=100 ){
alert("嫁吧,比上不足，比下有余");
}
else{
alert("滚吧,不嫁");
}
</script>
</head>
<body>
</body>
</html>
if3
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
<script type="text/javascript">
var num1 = +prompt("请输入第一个数:");
var num2 = +prompt("请输入第二个数:");
var num3 = +prompt("请输入第三个数:");
alert(typeof num1);
//找到三个数中最小的数
if(num1 < num2 && num1 < num3){
//num1最小，比较num2和num3
if(num2 < num3){
//num1 num2 num3
alert(num1 +","+num2 + ","+num3);
}else{
//num1 num3 num2
alert(num1 +","+num3 + ","+num2);
}
}else if(num2 < num1 && num2 < num3){
//num2最小，比较num1和num3
if(num1 < num3){
//num2 num1 num3
alert(num2 +","+num1 + ","+num3);
}else{
//num2 num3 num1
alert(num2 +","+num3 + ","+num1);
}
}else{
//num3最小,比较num1和num2
if(num1 < num2){
// num3 num1 num2
alert(num3 +","+num1 + ","+num2);
}else{
//num3 num2 num1
alert(num3 +","+num2 + ","+num1);
}
}
</script>
</head>
<body>
</body>
</html>
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