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JavaScript Set集合 size Property
tryjsref_set_size
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<!DOCTYPE html> <html> <body> <h1>JavaScript Sets</h1> <h2>The size Property</h2> <p>The size property returns the number of elements in a set.</p> <p id="demo"></p> <script> // Create a new Set const letters = new Set(["a","b","c"]); // Display the Size document.getElementById("demo").innerHTML = "The set has " + letters.size + " elements."; </script> </body> </html>