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JavaScript Map keys() 方法
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<!DOCTYPE html> <html> <body> <h1>JavaScript Maps</h1> <p id="demo"></p> <script> // Create Objects const apples = {name: 'Apples'}; const bananas = {name: 'Bananas'}; const oranges = {name: 'Oranges'}; // Create a Map const fruits = new Map(); // Add Elements to the Map fruits.set(apples, 500); fruits.set(bananas, 300); fruits.set(oranges, 200); document.getElementById("demo").innerHTML = fruits.get("apples"); </script> </body> </html>