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<script type="text/javascript">
/*
* 从键盘输入小明的期末成绩:
* 当成绩为100时,'奖励一辆BMW'
* 当成绩为[80-99]时,'奖励一台iphone15s'
* 当成绩为[60-80]时,'奖励一本参考书'
* 其他时,什么奖励也没有
*/
var score = prompt('请输入小明的期末成绩(0-100):');
if(score == 100){
alert('BMW');
}else if(score >= 80 && score <=99){
alert('iphone15s');
}else if(score >= 60 && score < 80){
alert('参考书');
}else{
alert('啥也没有');
}
</script>
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<title>if练习2</title>
<script type="text/javascript">
/*
* 大家都知道,男大当婚,女大当嫁。那么女方家长要嫁女儿,当然要提出一定的条件:
* 高:180cm以上; 富:1000万以上; 帅:500以上;
* 如果这三个条件同时满足,则:'我一定要嫁给他'
* 如果三个条件有为真的情况,则:'嫁吧,比上不足,比下有余。'
* 如果三个条件都不满足,则:'不嫁!'
*/
var H = 180, M = 10000000, F = 500;
if(H >= 180 && M >= 10000000 && F >= 500){
alert('我一定要嫁给他');
}else if(H >= 180 || M >= 10000000 || F >= 500){
alert('嫁吧,比上不足,比下有余');
}else{
alert('不嫁');
}
</script>
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<title>switch练习1</title>
<script type="text/javascript">
/*
* 对于成绩大于等于60分的,输出'合格'。低于60分的,输出'不合格'
*/
var score = parseInt(prompt('请输入成绩'));
switch (true) {
case score>=60:
alert('合格');
break;
default:
alert('不合格');
break;
}
</script>
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<title>switch练习2</title>
<script type="text/javascript">
/*
* 从键盘接收整数参数,如果该数为1-7,打印对应的星期,否则打印非法参数。
*/
var today = parseInt(prompt('请输入1-7:'));
switch (today) {
case today = 1:
alert('星期一');
break;
case today = 2:
alert('星期二');
break;
case today = 3:
alert('星期三');
break;
case today = 4:
alert('星期四');
break;
case today = 5:
alert('星期五');
break;
case today = 6:
alert('星期六');
break;
case today = 7:
alert('星期日');
break;
default:
alert('非法参数')
}
</script>
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