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JavaScript Map 方法
tryjs_map_has_deleted
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<!DOCTYPE html> <html> <body> <h1>JavaScript Maps</h1> <h2>The has() Method</h2> <p id="demo"></p> <script> // Create a Map const fruits = new Map([ ["apples", 500], ["bananas", 300], ["oranges", 200] ]); // Delete an Element fruits.delete("apples"); document.getElementById("demo").innerHTML = fruits.has("apples"); </script> </body> </html>