if语句

if练习1

<script type="text/javascript">

    var score = prompt("请输入小明期末成绩(0-100):");
    if(score == 100){
        alert("奖励宝马车一辆");
    }else if(score >= 80){
        alert("奖励iphonex手机一部");
    }else if(score >= 60){
        alert("参考书");
    }else {
        alert("什么也没有")
    }
</script>

if练习2

<script type="text/javascript">
    var height = prompt("请输入你的身高");
    var mongy = prompt("请输入你的金钱");
    var face = prompt("请输入颜值");
    if (height > 180 && mongy >=1000 && face >= 500){
        alert("我一定要嫁给他")
    }
    else if(height <= 180 || mongy<= 1000 || face<=500){
        alert("有点不乐意")
    }
    else {
        alert("不嫁")
    }
</script>

if练习3

<script type="text/javascript">
var n1 = prompt("请输入数字");
var n2 = prompt("请输入数字");
var n3 = prompt("请输入数字");
//找到3个数中最小的数
if(n1 < n2 && n1 < n3){
if (n2 < n3){
alert(n1 + ',' + n2 +',' + n3);
}else{
alert(n1 + ',' + n3 +',' + n2);
}
}else if(n2 < n1 && n2 < n3){
if (n1 < n3){
alert(n2 + ',' + n3 + ',' +n1);
}
}else {
if (n1 < n2){
alert(n3 + ',' + n1 + ',' +n2);
}else {
alert(n3 + ',' + n2 + ',' +n1);
}
}
</script>