JavaScript_前置递增和后置递增
原创
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
<script>
// 1. 想要一个变量自己加1 num = num + 1 比较麻烦
var num = 1;
num = num + 1; // ++num
num = num + 1;
console.log(num); // 3
// 2. 前置递增运算符 ++ 写在变量的前面
var age = 10;
++age; // 类似于 age = age + 1
console.log(age);
// 3. 先加1 后返回值
var p = 10;
console.log(++p + 10);
</script>
</head>
<body>
</body>
</html>
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
<script>
var num = 10;
num++; // num = num + 1 ++num;
console.log(num);
// 1. 前置自增和后置自增如果单独使用 效果是一样的
// 2. 后置自增 口诀：先返回原值 后自加1
var age = 10;
console.log(age++ + 10);
console.log(age);
</script>
</head>
<body>
</body>
</html>
