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