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编码猿
2024-09-27 02:06:13 +08:00
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历届学生/吴欣阳/每天课程/2021-06-10/条件语句.html Normal file
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>条件语句</title>
</head>
<body>
</body>
<script>
// if (判断条件) {
// }
// var a = true;
// if (a) {
// console.log("出去吃饭");
// } else {
// console.log("在家吃饭");
// }
// if (a) console.log("出去吃饭");
// else console.log("在家吃饭");
// 三元(目)运算
// a ? console.log("出去吃饭") : console.log("在家吃饭")
// var cj = 99999;
// if ( cj < 60 ) {
// console.log("不及格");
// } else if ( 60 <= cj && cj <= 70 ) {
// console.log("一般");
// } else if ( 70 < cj && cj <= 80 ) {
// console.log("普通");
// } else if ( 80 < cj && cj <= 90 ) {
// console.log("优秀");
// } else if ( 90 < cj && cj <= 100 ) {
// console.log("学霸");
// } else {
// console.log("分数错误，最高100分");
// }
// var name = "bmy1", pwd = "123"
// if (name == "bmy") {
// if (pwd == "123") {
// console.log("用户名和密码都正确,可以登录");
// } else {
// console.log("密码错误");
// }
// } else {
// console.log("用户名错误");
// }
// if (name == "bmy" && pwd == "123") {
// console.log("用户名和密码都正确,可以登录");
// } else {
// console.log("用户名或密码错误,请检查");
// }
// switch 一个变量有多种数值的场景
var type = 1;
switch (type) {
case 1:
console.log("1111");
break;
case 2:
console.log("2222");
break;
default:
console.log("都不相等");
break;
}
</script>
</html>