<!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>纯函数默写第一遍</title>
</head>
<body>
<script>
function getArea(r) {
return Math.PI * r * r;
}
function memorize(func) {
let obj = {};
return function () {
let key = JSON.stringify([...arguments]);
if (!obj[key]) {
console.log(123);
obj[key] = func(...arguments);
}
return obj[key];
};
}
let getOneArea = memorize(getArea);
console.log(getOneArea(5));
console.log(getOneArea(5));
console.log(getOneArea(5));
console.log(getOneArea(5));
console.log(getOneArea(5));
console.log(getOneArea(4));
</script>
</body>
</html>
