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JavaScript Set集合 has() 方法
tryjsref_set_has
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<!DOCTYPE html> <html> <body> <h1>JavaScript Sets</h1> <h2>The has() Method</h2> <p>The has() method returns true if a set contains a spesific value:</p> <p id="demo"></p> <script> // Create a new Set const letters = new Set(["a","b","c"]); // Does the Set contain "d"? answer = letters.has("d"); document.getElementById("demo").innerHTML = "The answer is " + answer; </script> </body> </html>