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JavaScript Map 映射
tryjs_map_set_new
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<!DOCTYPE html> <html> <body> <h1>JavaScript Maps</h1> <h2>The set() Method</h2> <p id="demo"></p> <script> // Create a new Map const fruits = new Map(); // Set Map Values fruits.set("apples", 500); fruits.set("bananas", 300); fruits.set("oranges", 200); let numb = fruits.get("apples"); document.getElementById("demo").innerHTML = "There are " + numb + " apples."; </script> </body> </html>