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JavaScript Set 集合
tryjs_set_instanceof
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<!DOCTYPE html> <html> <body> <h1>JavaScript Sets</h1> <h2>The instanceOf Operator</h2> <p>The instanceof Set returns true:</p> <p id="demo"></p> <script> // Create a new Set const letters = new Set(["a","b","c"]); // Display typeof document.getElementById("demo").innerHTML = letters instanceof Set; </script> </body> </html>