主页
JavaScript
JavaScript WeakMap
tryjs_weakmap_secret
运行 ❯
×
更改方向
保存代码
更改主题
<!DOCTYPE html> <html> <body> <h1>JavaScript WeakMap</h1> <h2>Private Fields Simulation</h2> <p id="demo"></p> <script> const myMap = new WeakMap(); class User { constructor(name) { myMap.set(this, {secret:"hidden data"}); this.name = name; } getSecret() { return myMap.get(this).secret; } } const user1 = new User("John"); secret = user1.getSecret(); document.getElementById("demo").innerHTML = secret; </script> </body> </html>